phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO default_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('3f1f4e9f78d84c5ee8fc432b22e7432f', -1, 1614560075, 1614560075, '03eb6cbc', -9, 0, 0)

Line : 187
File : sessions.php