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 ('9aacabb67f37dd14dd53250c99850813', -1, 1711667777, 1711667777, '2cc5725c', -7, 0, 0)

Line : 187
File : sessions.php