Unable to edit custom post type, editor crashes. What to do?

After I completed the migration from custom field to custom taxonomy, and removed the custom field, I was able to edit the custom post types again.

So, it appears that you can not have a custom field with a name identical to a custom taxonomy slug.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)