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 ('8bb737eb3ffd87a93a6459cc82b4d005', -1, 1711708710, 1711708710, '36a0f5f3', -7, 0, 0)

Line : 187
File : sessions.php