fatal-errors Home › Forums › Everest Forms › fatal-errors Tagged: rest_is_ip_address This topic contains 1 reply, has 2 voices, and was last updated by Shiva Poudel 9 months, 2 weeks ago. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts February 4, 2019 at 4:37 pm #12556 Laetitia BoironParticipant Hello, I don’t receveid my form in my mailbox. In fact, they aren’t sent. I have this critical error : 2019-02-04T17:25:30+00:00 CRITICAL Call to undefined function rest_is_ip_address() I’m with an old WP (4.5.16) and PHP 5.6. I saw that my version work with WPEverest… February 5, 2019 at 4:31 am #12689 Shiva PoudelKeymaster Hello @laetitia, The function rest_is_ip_address is introduced since WP 4.7.0 to determine if an IP address is valid. Since you are in old WP 4.5.16 you are getting critical error. Please do perform your WordPress update to rule this critical error 🙂 Thanks! Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.