diff --git a/app/time_conditions/time_conditions.php b/app/time_conditions/time_conditions.php
index b4572404b1..ada4477da3 100644
--- a/app/time_conditions/time_conditions.php
+++ b/app/time_conditions/time_conditions.php
@@ -248,7 +248,7 @@
 	echo "<br><br>";
 	echo "</form>";
 
-	if (sizeof($dialplan_ids) > 0) {
+	if (is_array($dialplan_ids) && sizeof($dialplan_ids) > 0) {
 		echo "<script>\n";
 		echo "	function check(what) {\n";
 		foreach ($dialplan_ids as $checkbox_id) {
@@ -261,4 +261,4 @@
 //include the footer
 	require_once "resources/footer.php";
 
-?>
\ No newline at end of file
+?>