diff --git a/composer.lock b/composer.lock
index 0c75691..f7c19de 100644
--- a/composer.lock
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-            "version": "v1.24.0",
+            "version": "v1.25.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php72.git",
@@ -1380,7 +1394,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-php72/tree/v1.24.0"
+                "source": "https://github.com/symfony/polyfill-php72/tree/v1.25.0"
             },
             "funding": [
                 {
@@ -1400,7 +1414,7 @@
         },
         {
             "name": "symfony/polyfill-php73",
-            "version": "v1.24.0",
+            "version": "v1.25.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php73.git",
@@ -1459,7 +1473,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-php73/tree/v1.24.0"
+                "source": "https://github.com/symfony/polyfill-php73/tree/v1.25.0"
             },
             "funding": [
                 {
@@ -1479,16 +1493,16 @@
         },
         {
             "name": "symfony/polyfill-php80",
-            "version": "v1.24.0",
+            "version": "v1.25.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php80.git",
-                "reference": "57b712b08eddb97c762a8caa32c84e037892d2e9"
+                "reference": "4407588e0d3f1f52efb65fbe92babe41f37fe50c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/57b712b08eddb97c762a8caa32c84e037892d2e9",
-                "reference": "57b712b08eddb97c762a8caa32c84e037892d2e9",
+                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/4407588e0d3f1f52efb65fbe92babe41f37fe50c",
+                "reference": "4407588e0d3f1f52efb65fbe92babe41f37fe50c",
                 "shasum": ""
             },
             "require": {
@@ -1542,7 +1556,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-php80/tree/v1.24.0"
+                "source": "https://github.com/symfony/polyfill-php80/tree/v1.25.0"
             },
             "funding": [
                 {
@@ -1558,26 +1572,26 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-09-13T13:58:33+00:00"
+            "time": "2022-03-04T08:16:47+00:00"
         },
         {
             "name": "symfony/service-contracts",
-            "version": "v2.5.0",
+            "version": "v2.5.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/service-contracts.git",
-                "reference": "1ab11b933cd6bc5464b08e81e2c5b07dec58b0fc"
+                "reference": "24d9dc654b83e91aa59f9d167b131bc3b5bea24c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/1ab11b933cd6bc5464b08e81e2c5b07dec58b0fc",
-                "reference": "1ab11b933cd6bc5464b08e81e2c5b07dec58b0fc",
+                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/24d9dc654b83e91aa59f9d167b131bc3b5bea24c",
+                "reference": "24d9dc654b83e91aa59f9d167b131bc3b5bea24c",
                 "shasum": ""
             },
             "require": {
                 "php": ">=7.2.5",
                 "psr/container": "^1.1",
-                "symfony/deprecation-contracts": "^2.1"
+                "symfony/deprecation-contracts": "^2.1|^3"
             },
             "conflict": {
                 "ext-psr": "<1.1|>=2"
@@ -1625,7 +1639,7 @@
                 "standards"
             ],
             "support": {
-                "source": "https://github.com/symfony/service-contracts/tree/v2.5.0"
+                "source": "https://github.com/symfony/service-contracts/tree/v2.5.1"
             },
             "funding": [
                 {
@@ -1641,7 +1655,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-11-04T16:48:04+00:00"
+            "time": "2022-03-13T20:07:29+00:00"
         }
     ],
     "packages-dev": [
@@ -1839,25 +1853,29 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.10.2",
+            "version": "1.11.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
+                "reference": "14daed4296fae74d9e3201d2c4925d1acb7aa614"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/776f831124e9c62e1a2c601ecc52e776d8bb7220",
-                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/14daed4296fae74d9e3201d2c4925d1acb7aa614",
+                "reference": "14daed4296fae74d9e3201d2c4925d1acb7aa614",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.1 || ^8.0"
             },
+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3,<3.2.2"
+            },
             "require-dev": {
-                "doctrine/collections": "^1.0",
-                "doctrine/common": "^2.6",
-                "phpunit/phpunit": "^7.1"
+                "doctrine/collections": "^1.6.8",
+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
             },
             "type": "library",
             "autoload": {
@@ -1882,7 +1900,7 @@
             ],
             "support": {
                 "issues": "https://github.com/myclabs/DeepCopy/issues",
-                "source": "https://github.com/myclabs/DeepCopy/tree/1.10.2"
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.11.0"
             },
             "funding": [
                 {
@@ -1890,7 +1908,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-11-13T09:40:50+00:00"
+            "time": "2022-03-03T13:19:32+00:00"
         },
         {
             "name": "nette/bootstrap",
@@ -1975,22 +1993,22 @@
         },
         {
             "name": "nette/di",
-            "version": "v3.0.12",
+            "version": "v3.0.13",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nette/di.git",
-                "reference": "11c236b9f7bbfc5a95e7b24742ad8847936feeb5"
+                "reference": "9878f2958a0a804b08430dbc719a52e493022739"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nette/di/zipball/11c236b9f7bbfc5a95e7b24742ad8847936feeb5",
-                "reference": "11c236b9f7bbfc5a95e7b24742ad8847936feeb5",
+                "url": "https://api.github.com/repos/nette/di/zipball/9878f2958a0a804b08430dbc719a52e493022739",
+                "reference": "9878f2958a0a804b08430dbc719a52e493022739",
                 "shasum": ""
             },
             "require": {
                 "ext-tokenizer": "*",
-                "nette/neon": "^3.3",
-                "nette/php-generator": "^3.5.4",
+                "nette/neon": "^3.3 || ^4.0",
+                "nette/php-generator": "^3.5.4 || ^4.0",
                 "nette/robot-loader": "^3.2",
                 "nette/schema": "^1.1",
                 "nette/utils": "^3.1.6",
@@ -2044,9 +2062,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nette/di/issues",
-                "source": "https://github.com/nette/di/tree/v3.0.12"
+                "source": "https://github.com/nette/di/tree/v3.0.13"
             },
-            "time": "2021-12-15T21:05:11+00:00"
+            "time": "2022-03-10T02:43:04+00:00"
         },
         {
             "name": "nette/finder",
@@ -2117,16 +2135,16 @@
         },
         {
             "name": "nette/neon",
-            "version": "v3.3.2",
+            "version": "v3.3.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nette/neon.git",
-                "reference": "54b287d8c2cdbe577b02e28ca1713e275b05ece2"
+                "reference": "22e384da162fab42961d48eb06c06d3ad0c11b95"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nette/neon/zipball/54b287d8c2cdbe577b02e28ca1713e275b05ece2",
-                "reference": "54b287d8c2cdbe577b02e28ca1713e275b05ece2",
+                "url": "https://api.github.com/repos/nette/neon/zipball/22e384da162fab42961d48eb06c06d3ad0c11b95",
+                "reference": "22e384da162fab42961d48eb06c06d3ad0c11b95",
                 "shasum": ""
             },
             "require": {
@@ -2179,22 +2197,22 @@
             ],
             "support": {
                 "issues": "https://github.com/nette/neon/issues",
-                "source": "https://github.com/nette/neon/tree/v3.3.2"
+                "source": "https://github.com/nette/neon/tree/v3.3.3"
             },
-            "time": "2021-11-25T15:57:41+00:00"
+            "time": "2022-03-10T02:04:26+00:00"
         },
         {
             "name": "nette/php-generator",
-            "version": "v3.6.6",
+            "version": "v3.6.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nette/php-generator.git",
-                "reference": "ad7d0a77f58260001bd263605eb2b9fbaf1d61a7"
+                "reference": "b9ba414c9895fd9420887f20eeb4eabde123677f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nette/php-generator/zipball/ad7d0a77f58260001bd263605eb2b9fbaf1d61a7",
-                "reference": "ad7d0a77f58260001bd263605eb2b9fbaf1d61a7",
+                "url": "https://api.github.com/repos/nette/php-generator/zipball/b9ba414c9895fd9420887f20eeb4eabde123677f",
+                "reference": "b9ba414c9895fd9420887f20eeb4eabde123677f",
                 "shasum": ""
             },
             "require": {
@@ -2247,9 +2265,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nette/php-generator/issues",
-                "source": "https://github.com/nette/php-generator/tree/v3.6.6"
+                "source": "https://github.com/nette/php-generator/tree/v3.6.7"
             },
-            "time": "2022-02-20T18:06:09+00:00"
+            "time": "2022-03-10T01:51:00+00:00"
         },
         {
             "name": "nette/robot-loader",
@@ -2633,16 +2651,16 @@
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "1.6.0",
+            "version": "1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "93ebd0014cab80c4ea9f5e297ea48672f1b87706"
+                "reference": "77a32518733312af16a44300404e945338981de3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/93ebd0014cab80c4ea9f5e297ea48672f1b87706",
-                "reference": "93ebd0014cab80c4ea9f5e297ea48672f1b87706",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/77a32518733312af16a44300404e945338981de3",
+                "reference": "77a32518733312af16a44300404e945338981de3",
                 "shasum": ""
             },
             "require": {
@@ -2677,9 +2695,9 @@
             "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
             "support": {
                 "issues": "https://github.com/phpDocumentor/TypeResolver/issues",
-                "source": "https://github.com/phpDocumentor/TypeResolver/tree/1.6.0"
+                "source": "https://github.com/phpDocumentor/TypeResolver/tree/1.6.1"
             },
-            "time": "2022-01-04T19:58:01+00:00"
+            "time": "2022-03-15T21:29:03+00:00"
         },
         {
             "name": "phpspec/prophecy",
@@ -3876,16 +3894,16 @@
         },
         {
             "name": "symfony/finder",
-            "version": "v4.4.37",
+            "version": "v4.4.41",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "b17d76d7ed179f017aad646e858c90a2771af15d"
+                "reference": "40790bdf293b462798882ef6da72bb49a4a6633a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/b17d76d7ed179f017aad646e858c90a2771af15d",
-                "reference": "b17d76d7ed179f017aad646e858c90a2771af15d",
+                "url": "https://api.github.com/repos/symfony/finder/zipball/40790bdf293b462798882ef6da72bb49a4a6633a",
+                "reference": "40790bdf293b462798882ef6da72bb49a4a6633a",
                 "shasum": ""
             },
             "require": {
@@ -3918,7 +3936,7 @@
             "description": "Finds files and directories via an intuitive fluent interface",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/finder/tree/v4.4.37"
+                "source": "https://github.com/symfony/finder/tree/v4.4.41"
             },
             "funding": [
                 {
@@ -3934,11 +3952,11 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-01-02T09:41:36+00:00"
+            "time": "2022-04-14T15:36:10+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
-            "version": "v1.24.0",
+            "version": "v1.25.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-ctype.git",
@@ -4000,7 +4018,7 @@
                 "portable"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.24.0"
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.25.0"
             },
             "funding": [
                 {
@@ -4151,5 +4169,5 @@
         "php": ">=7.0"
     },
     "platform-dev": [],
-    "plugin-api-version": "2.2.0"
+    "plugin-api-version": "2.3.0"
 }
diff --git a/src/Calc/Calc.php b/src/Calc/Calc.php
index 25d1a27..426a7bb 100644
--- a/src/Calc/Calc.php
+++ b/src/Calc/Calc.php
@@ -131,7 +131,9 @@ class Calc
 
                             try {
                                 eval('@$p = ' . $formel . ';');
+                                $this->engine->addDebugCalcFormel($edge->getFormel(), $formel . ' = ' .  $p);
                             }catch (\Throwable $e) {
+                                $this->engine->addDebugCalcFormel($edge->getFormel(), $formel . ' = error');
                                 $p = 0;
                             }
                             //echo $option->getId(). ' / '.$formel . ' / '.$p.' / '.PHP_EOL.PHP_EOL;
diff --git a/src/Calc/CalcValues.php b/src/Calc/CalcValues.php
index 1b7833c..6ebff57 100644
--- a/src/Calc/CalcValues.php
+++ b/src/Calc/CalcValues.php
@@ -117,7 +117,9 @@ class CalcValues
                         $cv = $this->formelCalc->parse($edge->getCalcValue());
                         try {
                             eval('@$cv = ' . $cv . ';');
+                            $this->engine->addDebugCalcVariables($id, $edge->getCalcValue(), $cv . ' = ' . $cv);
                         }catch (\Throwable $e) {
+                            $this->engine->addDebugCalcVariables($id, $edge->getCalcValue(), $cv . ' = ERROR');
                             $cv = 0;
                         }
                         
diff --git a/src/Engine.php b/src/Engine.php
index c23eea7..94b079e 100644
--- a/src/Engine.php
+++ b/src/Engine.php
@@ -44,6 +44,12 @@ class Engine
     /** @var array */
     protected $displayVariables = array();
 
+    /** @var array */
+    protected $debugCalcFormel = array();
+
+    /** @var array */
+    protected $debugCalcVariables = array();
+
     /** @var float */
     protected $price = 0;
 
@@ -325,7 +331,26 @@ class Engine
     {
         $this->price = $price;
     }
+    
+    public function addDebugCalcVariables($id, $orgVar, $var)
+    {
+        $this->debugCalcVariables[$id] = [$orgVar, $var];
+    }
 
+    public function getDebugCalcVariables()
+    {
+        return $this->debugCalcVariables;
+    }
+    
+    public function addDebugCalcFormel($orgFormel, $formel)
+    {
+        $this->debugCalcFormel[] = [$orgFormel, $formel];
+    }
+
+    public function getDebugCalcFormel()
+    {
+        return $this->debugCalcFormel;
+    }
     /**
      * @return array
      */
@@ -476,4 +501,4 @@ class Engine
     {
         $this->displayVariables[$key] = $value;
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Customer/A/CalcTest.php b/tests/Customer/A/CalcTest.php
index afab794..910a6d4 100644
--- a/tests/Customer/A/CalcTest.php
+++ b/tests/Customer/A/CalcTest.php
@@ -53,4 +53,4 @@ class CalcTest extends \PHPUnit_Framework_TestCase
         $this->engine->setVariable('druckfarben_inhalt', 8);
         $this->assertEquals(339.15 , $this->engine->getPrice());
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Customer/B/CalcTest.php b/tests/Customer/B/CalcTest.php
index 8c2a952..810db60 100644
--- a/tests/Customer/B/CalcTest.php
+++ b/tests/Customer/B/CalcTest.php
@@ -41,4 +41,4 @@ class CalcTest extends \PHPUnit_Framework_TestCase
     {
         $this->assertEquals(945.00, $this->engine->getPrice());
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Customer/C/CalcTest.php b/tests/Customer/C/CalcTest.php
index 31f284a..cc03016 100644
--- a/tests/Customer/C/CalcTest.php
+++ b/tests/Customer/C/CalcTest.php
@@ -43,12 +43,14 @@ class CalcTest extends \PHPUnit_Framework_TestCase
     public function testVariant1()
     {
         $this->engine->setVariable('seiten_umschlag', 0);
-        $this->assertEquals(356.46 , $this->engine->getPrice());
+        $price = $this->engine->getPrice();
+        $this->assertEquals(356.46 , $price);
     }
     public function testVariant2()
     {
         $this->engine->setVariable('seiten_umschlag', 0);
         $this->engine->setVariable('aufschlag', 50);
-        $this->assertEquals(406.46 , $this->engine->getPrice());
+        $price = $this->engine->getPrice();
+        $this->assertEquals(406.46 , $price);
     }
-}
\ No newline at end of file
+}