“Empty String” error on empty settings fields in PHP 7.1 or higher

  • Looks like you need to add an error check for the Document Height and Download Button Text fields on the plugin settings page.

    If you don’t then after upgrading to PHP version 7.1 or higher you get something similar to the following error
    "Warning: Cannot assign an empty string to a string offset in /home/XXXXXX/public_html/wp-includes/class.wp-scripts.php on line 486"

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