Index: webform.module
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- webform.module	(revision d2a4e823d1c4a6f914654c6ae817449c8791a85f)
+++ webform.module	(revision 3bf0c0116cc41bffc7aba2152bf101e1c46405e1)
@@ -3050,7 +3050,7 @@
     // #value data.
     elseif (isset($elements['#element_validate'])) {
       foreach ($elements['#element_validate'] as $function) {
-        if (function_exists($function))  {
+        if (is_callable($function))  {
           $function($elements, $form_state, $form_state['complete form']);
         }
       }