diff --git a/plugins/system/debug/debug.php b/plugins/system/debug/debug.php
index bc81ed3c8db95..b01a7730b18af 100644
--- a/plugins/system/debug/debug.php
+++ b/plugins/system/debug/debug.php
@@ -360,7 +360,7 @@ protected function display($item, array $errors = array())
 			return __METHOD__ . ' -- Unknown method: ' . $fncName . '<br />';
 		}
 
-		$html = '';
+		$html = array();
 
 		$js = "toggleContainer('dbg_container_" . $item . "');";