Exclude children of excluded parent elements (IRRE, sys_file_reference) -> PHP Warning

[interactivevalues]

When I check the checkbox for Exclude children of excluded parent elements (IRRE, sys_file_reference) the export does not work.
It shows the following error:
Export failed
PHP Warning: Undefined array key "l10nmgr" in /vendor/localizationteam/l10nmgr/Classes/Model/Tools/Tools.php line 1730 (1476107295)