diff --git a/composer.json b/composer.json
index 986cf65..6ed30c1 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
     }
   },
   "require": {
-    "php": ">=5.4",
+    "php": ">=7.0",
     "doctrine/orm": "^2.5"
   },
   "require-dev": {
diff --git a/src/Calc/CalcValues.php b/src/Calc/CalcValues.php
index 0b935ff..4c01881 100644
--- a/src/Calc/CalcValues.php
+++ b/src/Calc/CalcValues.php
@@ -83,8 +83,12 @@ class CalcValues
         $calcValueAccount1 = 0;
         $calcValueAccount2 = 0;
 
-        eval($this->engine->getParameters());
-        eval($this->engine->getFormulas());
+        try{
+            @eval($this->engine->getParameters());
+            @eval($this->engine->getFormulas());
+        }catch (\Throwable $e) {
+
+        }
 
         /** @var EdgeCollection $collection */
         foreach ($container as $collection) {
diff --git a/src/Calc/Formel.php b/src/Calc/Formel.php
index f64448d..6fef875 100644
--- a/src/Calc/Formel.php
+++ b/src/Calc/Formel.php
@@ -82,8 +82,12 @@ class Formel
         preg_match_all('/\$P\w*\$P/', $formel, $founds);
 
         if (!empty($founds [0])) {
-            eval(str_replace('\\', '', $this->engine->getParameters()));
+            try{
+                @eval($this->engine->getParameters());
+                @eval($this->engine->getFormulas());
+            }catch (\Throwable $e) {
 
+            }
             foreach ($founds [0] as $key => $found) {
                 $foundvalue = str_replace('$P', '', $found);
                 if (isset($$foundvalue)) {
@@ -102,7 +106,12 @@ class Formel
         preg_match_all('/\$F\w*\$F/', $formel, $founds);
 
         if (!empty($founds [0])) {
-            eval(str_replace('\\', '', $this->engine->getFormulas()));
+            try{
+                @eval($this->engine->getParameters());
+                @eval($this->engine->getFormulas());
+            }catch (\Throwable $e) {
+
+            }
 
             foreach ($founds [0] as $key => $found) {
                 $foundvalue = str_replace('$F', '', $found);