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 ('3992c8f0b248984050d5a4f9e26d0be9', -1, 1713571169, 1713571169, '12de0a09', 4, 0, 0)

Line : 187
File : sessions.php