Similar to what will be added into the next version of wordpress to allow this issue to gracefully be handled instead of fatal error https://core.trac.ww.wp.xz.cn/changeset/57925
I have updated the addon PHP file in gravity forms to set domain to false if it is not a string.
File to edit:
wp-content/plugins/gravityforms/includes/addon/class-gf-addon.php
line 6537:
public function load_text_domain() {
$textdomain = $this->_slug;
if ( ! is_string( $textdomain ) ) {
$textdomain = false;
}
GFCommon::load_gf_text_domain($textdomain, plugin_basename(dirname($this->_full_path)));
}
This is just a temporary fix that might get overwritten when a new gravity forms update is released.
