添加新项目时TYPO3 8.6中的TCA错误

When I want to add new records in TYPO3 8.6 with go_maps_ext, I get the following error:

Argument 3 passed to 
TYPO3\CMS\Core\DataHandling\Localization\DataMapProcessor::synchronizeTranslationItem() 
must be of the type integer, null given, called in 
.../typo3/sysext/core/Classes/DataHandling/Localization/DataMapProcessor.php on line 195

The TCA definition can be watched on GitHub https://github.com/mhirdes/go_maps_ext/blob/master/Configuration/TCA/tx_gomapsext_domain_model_address.php

It dosen't matter if I want to insert a new map or address. Any suggestions? Thanks a lot in advance.

this is a known a issue, see https://forge.typo3.org/issues/79853 in the issue tracker. the problem is that in the extension the default value for the language is -1 which means "all languages". if this is changed to default, at least that will at least work