diff --git a/lib/Listener/BeforeFetchPreviewListener.php b/lib/Listener/BeforeFetchPreviewListener.php
index cbff34597c..cb1c6dc77e 100644
--- a/lib/Listener/BeforeFetchPreviewListener.php
+++ b/lib/Listener/BeforeFetchPreviewListener.php
@@ -43,6 +43,7 @@ public function handle(Event $event): void {
 		}
 		$shareToken = $this->request->getParam('token');
 
+		$share = null;
 		try {
 			$share = $shareToken ?
 				// Get different share for public previews as the share from the node is only set for mounted shares