I am getting these errors frequently (multiple times per day). Any hints?

Database error in 

Query:
INSERT INTO `sys_accounts` SET `name` = 'redacted',`email` = 'redacted-email',`receive_news` = '0',`email_confirmed` = '0',`password` = 'redacted',`password_changed` = '1752692966',`salt` = 'redacted/W',`added` = '1752692966',`changed` = '1752692966',`ip` = 'redacted',`referred` = 'redacted/create-account',`phone` = ''

Mysql error:
Duplicate entry 'redacted-email' for key 'email'

Location:
The error was found in query function in the file /redacted/inc/classes/BxDolForm.php at line 910.

collation_connection:
utf8mb4_unicode_ci