diff --git a/libraries/src/MVC/Controller/BaseController.php b/libraries/src/MVC/Controller/BaseController.php
index 8bffe8e4ff13e..96f4997e50b60 100644
--- a/libraries/src/MVC/Controller/BaseController.php
+++ b/libraries/src/MVC/Controller/BaseController.php
@@ -709,7 +709,7 @@ public function execute($task)
 	{
 		$this->task = $task;
 
-		$task = strtolower($task);
+		$task = (isset($task) && $task) ? strtolower($task) : '';
 
 		if (isset($this->taskMap[$task]))
 		{