I’m having the same issue.
Seeing this warning appearing in a number of places.
It’s on the Constant Contact plugin settings page:
/wp-admin/admin.php?page=gf_settings&subview=gravity-forms-constant-contact
Screenshot:
https://paste.pics/34XMP
And on the feeds page:
/wp-admin/admin.php?page=gf_edit_forms&view=settings&subview=gravity-forms-constant-contact&id=4
Screenshot:
https://paste.pics/34XMV
WP Version: 4.9.5
GF Version: 2.3.1
CC Add-on Version: 3.1
Thanks,
Damien
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This reply was modified 8 years ago by
fishnaldo.
Same issue on one of my site:
Warning: hash_equals(): Expected user_string to be a string, boolean given in /home/pa201780/public_html/iirp.eu/wp-content/plugins/gravityforms/common.php on line 5430
I just released Version 3.1.1 that fixes this issue. Thank you for sharing!