This is a 2-step fix.
1. The author left out the “instructions” column. Run this SQL (replace wp_ with your prefix if needed):
ALTER TABLE wp_acf_fields ADD COLUMN instructions text DEFAULT NULL;
2. On line 63 of core/fields_save.php, change
'save_as_cf' => $field['save_as_cf'],
'save_as_cf' => (int) $field['save_as_cf'],
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