lib/doorkeeper/models/concerns/revocable.rb in doorkeeper-5.1.0.rc2 vs lib/doorkeeper/models/concerns/revocable.rb in doorkeeper-5.1.0

@@ -23,10 +23,11 @@
       # Revokes token with `:refresh_token` equal to `:previous_refresh_token`
       # and clears `:previous_refresh_token` attribute.
       #
       def revoke_previous_refresh_token!
         return unless refresh_token_revoked_on_use?
-        old_refresh_token.revoke if old_refresh_token
+
+        old_refresh_token&.revoke
         update_attribute :previous_refresh_token, ""
       end
 
       private