diff --git a/lib/main.js b/lib/main.js
index f91008e..9afb241 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -120,7 +120,7 @@
 			logging.verbose("send back the persistent random seeds", persistentRndStorage.persistentRnd);
 			port.postMessage({
 				tabId: port.sender.tab.id,
-				cookieStoreId: port.sender.tab.cookieStoreId,
+				cookieStoreId: port.sender.tab.cookieStoreId || "",
 				persistentRnd: persistentRndStorage.persistentRnd,
 				persistentIncognitoRnd: persistentRndStorage.persistentIncognitoRnd
 			});
diff --git a/releaseNotes.txt b/releaseNotes.txt
index 32881eb..39ba1b6 100644
--- a/releaseNotes.txt
+++ b/releaseNotes.txt
@@ -6,7 +6,7 @@ Version 1.4:
 		- 
 	
 	fixes:
-		- 
+		- Fix stuck Fenix
 	
 	known issues:
 		- if a data URL is blocked the page action button does not appear