In some cases when creating a field, I get the following error: "Undefined offset: 0" on line 398 of website/modules/backend/FormWidgets/Repeater.php
I have no idea what causes this, as it seems to be random. It doesn't seem to matter whether the repeater max is 0, 1 or 99. The entered field do not seem to matter either.
Can you please provide me with a fix?