From b9f72a001bca4772a003248595ad20b13a5b2277 Mon Sep 17 00:00:00 2001
From: Bruce Wells <bruce.wells@simparel.com>
Date: Wed, 24 Oct 2018 14:16:11 -0400
Subject: Additional validation for bad expressions (*+ for example)

---
 src/NXP/Classes/Calculator.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/NXP/Classes/Calculator.php')

diff --git a/src/NXP/Classes/Calculator.php b/src/NXP/Classes/Calculator.php
index bfa7015..253e70c 100644
--- a/src/NXP/Classes/Calculator.php
+++ b/src/NXP/Classes/Calculator.php
@@ -54,7 +54,7 @@ class Calculator
             }
         }
         $result = array_pop($stack);
-        if (!empty($stack)) {
+        if ($result === null || ! empty($stack)) {
             throw new IncorrectExpressionException();
         }
 
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