diff --git a/plugins/system/debug/debug.php b/plugins/system/debug/debug.php
index 1b98e7db1145b..7481dfe0cd571 100644
--- a/plugins/system/debug/debug.php
+++ b/plugins/system/debug/debug.php
@@ -868,7 +868,7 @@ protected function displayQueries()
 		// Fix first bar width.
 		$minWidth = 0.3;
 
-		if ($bars[0]->width < $minWidth && isset($bars[1]))
+		if (isset($bars[0]) && $bars[0]->width < $minWidth && isset($bars[1]))
 		{
 			$bars[1]->pre -= ($minWidth - $bars[0]->width);