diff --git a/app/call_center_active/call_center_active_inc.php b/app/call_center_active/call_center_active_inc.php
index 533867cc00..d1bc6f0bd0 100644
--- a/app/call_center_active/call_center_active_inc.php
+++ b/app/call_center_active/call_center_active_inc.php
@@ -248,7 +248,7 @@ else {
 				$switch_cmd = 'callcenter_config queue list members '.$queue_name;
 				$event_socket_str = trim(event_socket_request($fp, 'api '.$switch_cmd));
 				$result = str_to_named_array($event_socket_str, '|');
-				if (strlen($result) == 0) { unset($result); }
+				if (!is_array($result)) { unset($result); }
 
 			//show the title
 				$q_waiting=0;