diff --git a/app/operator_panel/index.php b/app/operator_panel/index.php
index 481696d0ba..31827423b0 100644
--- a/app/operator_panel/index.php
+++ b/app/operator_panel/index.php
@@ -199,7 +199,7 @@ require_once "resources/header.php";
 //refresh controls
 	function refresh_stop() {
 		clearInterval(interval_timer_id);
-		document.getElementById('refresh_state').innerHTML = "<img src='resources/images/refresh_paused.png' style='width: 16px; height: 16px; border: none; margin-top: 1px; cursor: pointer;' onclick='refresh_start();' alt=\"<?php echo $text['label-refresh_enable']?>\" title=\"<?php echo $text['label-refresh_enable']?>\">";
+		if (document.getElementById('refresh_state')) { document.getElementById('refresh_state').innerHTML = "<img src='resources/images/refresh_paused.png' style='width: 16px; height: 16px; border: none; margin-top: 1px; cursor: pointer;' onclick='refresh_start();' alt=\"<?php echo $text['label-refresh_enable']?>\" title=\"<?php echo $text['label-refresh_enable']?>\">"; }
 	}
 
 	function refresh_start() {