[TYPO3-english] Update from TYPO3 7.x -> TYPO3 8.x: error with upgradeWizard from Install Tool

[Bert Hiddink [BENDOO e-work solutions]]

Hello,

When upgrading from 7.x to 8.7.2 and running the step "Execute database 
migrations on single rows" with the upgradeWizard from Install Tool, I 
get the following error:

Argument 3 passed to 
TYPO3\CMS\Core\DataHandling\Localization\DataMapProcessor::synchronizeFieldValues() 
must be of the type array, null given, called in 
typo3_src-8.7.2/typo3/sysext/core/Classes/DataHandling/Localization/DataMapProcessor.php 
on line 316

TypeError thrown in file
typo3_src-8.7.2/typo3/sysext/core/Classes/DataHandling/Localization/DataMapProcessor.php 
in line 384.

Seems very similar to this bug https://forge.typo3.org/issues/79853 but 
this seems already  having been resolved in the 8.6-branch.

Any ideas where this error comes from?

Any ideas?

Thanks in advance!

Regards,
Bert