diff --git a/resources/functions.php b/resources/functions.php
index 23f9ce821e..c0425de69e 100644
--- a/resources/functions.php
+++ b/resources/functions.php
@@ -1571,8 +1571,10 @@ function number_pad($number,$n) {
 					case 'up': $direction = 'keyup'; break;
 				}
 			//check for element exceptions
-				if (sizeof($exceptions) > 0) {
-					$exceptions = "!$(e.target).is('".implode(',', $exceptions)."') && ";
+				if (is_array($exceptions)) {
+					if (sizeof($exceptions) > 0) {
+						$exceptions = "!$(e.target).is('".implode(',', $exceptions)."') && ";
+					}
 				}
 			//quote if selector is id or class
 				$subject = ($subject != 'window' && $subject != 'document') ? "'".$subject."'" : $subject;