Error: Warning: Illegal string offset ‘preset’

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Hi,

I upgraded to wordpress 4.7 and tried to use WP custom field search plugin with it.
I put the shortcode in a new page. But on top of the search form an error shows up, here it is in full length:

Warning: Illegal string offset ‘preset’ in C:\xampp\htdocs\000_LocalTest\wp-content\plugins\wp-custom-fields-search\wp-custom-fields-search.php on line 401

I’m reluctant to edit the plugin code, as I really don’t know how. The search, by the way, works just fine, I just need to get rid of the error.
Does anybody have an idea?

Best Regards,
Evi

• This topic was modified 1 minute ago by  evileu.