Same here, after last update (5.5.5 -> 5.5.6) repeater started throwing “advanced_custom_fields_pro/api/api-value.php line 264” errors.
But that happens only when I export code of my fields and load it from my functions.php.
If I don’t export code and just load fields from ACF, there’s no error.
In 5.5.5 there was no error both ways.
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