diff --git a/plugins/system/debug/debug.php b/plugins/system/debug/debug.php
index c9e744ba64354..7c534f7f2f6b7 100644
--- a/plugins/system/debug/debug.php
+++ b/plugins/system/debug/debug.php
@@ -748,7 +748,7 @@ protected function displayQueries()
 
 				// How heavy should the string length count: 0 - 1.
 				$ratio = 0.5;
-				$timeScore = $queryTime / (strlen($query) * $ratio) * 200;
+				$timeScore = $queryTime / ((strlen($query) + 1) * $ratio) * 200;
 
 				// Determine color of bargraph depending on query speed and presence of warnings in EXPLAIN.
 				if ($timeScore > 10)