diff --git a/src/DataCollector/RequestCollector.php b/src/DataCollector/RequestCollector.php
index ae828d1d..de372d18 100644
--- a/src/DataCollector/RequestCollector.php
+++ b/src/DataCollector/RequestCollector.php
@@ -272,7 +272,7 @@ protected function getRouteInformation($route)
                     $reflector->getEndLine()
                 );
 
-                if (isset($result['controller'])) {
+                if (isset($result['controller']) && is_string($result['controller'])) {
                     $result['controller'] .= '<a href="'.$link['url'].'" class="phpdebugbar-widgets-editor-link"></a>';
                 }
             } else {