diff --git a/.env.example b/.env.example
index 52084ab..4e5ff0a 100644
--- a/.env.example
+++ b/.env.example
@@ -33,7 +33,7 @@ SESSION_ENCRYPT=false
 SESSION_PATH=/
 # For cross-subdomain session sharing (e.g. webmail on mail.example.com):
 # SESSION_DOMAIN=.example.com
-SESSION_DOMAIN=null
+SESSION_DOMAIN=
 
 #BROADCAST_CONNECTION=log
 FILESYSTEM_DISK=local