diff --git a/apps/workflowengine/lib/Check/FileName.php b/apps/workflowengine/lib/Check/FileName.php
index c6afbf7afa..f775227f71 100644
--- a/apps/workflowengine/lib/Check/FileName.php
+++ b/apps/workflowengine/lib/Check/FileName.php
@@ -59,7 +59,7 @@ class FileName extends AbstractStringCheck {
 	 * @return string
 	 */
 	protected function getActualValue(): string {
-		return basename($this->path);
+		return $this->path === null ? '' : basename($this->path);
 	}
 
 	/**