Gridelements 8.8.0 throws Errors

Updating to the newest version of Gridelements for TYPO3 8 returns errors: Core: Error handler (BE): PHP Warning: Use of undefined constant colPos - assumed 'colPos' (this will throw an Error in a future version of PHP)

in gridelements/Classes/Hooks/DrawItem.php line 642

I think someone forgot to add the "$" . . . Or should this be some kinda constant which i cannot find?