Warning: strip_tags() expects parameter 1 to be string, array given in file path

  • I got an email from a client with this “Warning: strip_tags() expects parameter 1 to be string, array given in ‘file path/plugins/list-field-number-format-for-gravity-forms/gravitypdf/ITSG_GF_isNumber_Field.php’ on line 81”.

    I made a copy of the form giving the warning to test out, but I wasn’t able to re-create the problem. I’m not sure if it was just a one time glitch or what. The part in question is Page 3 of the form, “(PP13 or PPl7) SCHEDULE A MACHINERY, EQUIPMENT, FURNITURE AND LEASEHOLD IMPROVEMENTS” “MACHINERY & EQUIPMENT”.

    Is this something that can be fixed, or was it just some kind of user error?

    The page I need help with: [log in to see the link]

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