phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('8c0f816a02d2dc63a6a9ad5e5bfbf4c5', -1, 1713904744, 1713904744, '0389ab79', -4, 0, 0)

Line : 187
File : sessions.php