TYPO3 Core

if i create a new (taskcenter) action, with debug activeted, i get the following error:

caller t3lib_DB::exec_INSERTquery
ERROR Unknown column 'tablenames' in 'field list'
lastBuiltQuery INSERT INTO sys_action_asgr_mm
(
uid_local,
uid_foreign,
sorting,
tablenames
) VALUES (
'2',
'1',
'1',
''
)
debug_backtrace SC_alt_doc->processData // t3lib_TCEmain->process_datamap // t3lib_TCEmain->fillInFieldArray // t3lib_TCEmain->checkValue // t3lib_TCEmain->checkValue_SW // t3lib_TCEmain->checkValue_group_select // t3lib_TCEmain->checkValue_group_select_processDBdata // t3lib_loadDBGroup->writeMM // t3lib_DB->exec_INSERTquery // t3lib_DB->debug

i guess it has something to do with the new MM relations engine, right?

(issue imported from #M4898)