This line throws exception:

...because my sqlite (in php 8) return NULL in column 'to' in results from PRAGMA foreign_key_list(tablename)
Another columns has correct data.

This is simple fix:

if ($keys[$row['id']]['foreign'] //<== check if equal null	&& $keys[$row['id']]['foreign'][0] == null) {	$keys[$row['id']]['foreign'] = null; }