1 files changed, 4 insertions, 0 deletions
diff --git a/src/NXP/MathExecutor.php b/src/NXP/MathExecutor.php
index 9e7ce25..c5c7add 100644
--- a/src/NXP/MathExecutor.php
+++ b/src/NXP/MathExecutor.php
@@ -91,6 +91,10 @@ class MathExecutor
      */
     public function setVar($variable, $value)
     {
+        if (!is_numeric($value)) {
+            throw new \Exception("Variable ({$variable}) value must be a number ({$value}) type ({gettype($value)})");
+        }
+
         $this->variables[$variable] = $value;
 
         return $this;