Fatal Error on Edit Profile page

Hi, this appeared on the user edit profile page in the backend of WP:

Fatal error: Uncaught TypeError: sizeof(): Argument #1 ($value) must be of type Countable|array, bool given in /web/wp-content/plugins/pie-register/classes/profile_admin.php:552 Stack trace: #0 /web/wp-includes/class-wp-hook.php(324): Profile_admin->edit_user_profile() #1 /web/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #2 /web/wp-includes/plugin.php(517): WP_Hook->do_action() #3 /web/wp-admin/user-edit.php(891): do_action() #4 {main} thrown in /web/wp-content/plugins/pie-register/classes/profile_admin.php on line 552

The function sizeof() is being used on $this->data in profile_admin.php (line 552), but sometimes $this->data is false instead of an array. This happens when getCurrentFields($this->regFormForFreeVers()) returns false, causing a TypeError because sizeof() only works on arrays or countable objects.

Potential solution that worked for me:

Update line 552 to first check if $this->data is an array before using count().

Fixed Code:

if (is_array($this->data) && count($this->data) > 0)

This prevents the error by ensuring count() is only used on an actual array.