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 ('4783fbd3a3f7340ab56453c1df8590b0', -1, 1711651367, 1711651367, '22cc03c3', 2, 0, 0)

Line : 187
File : sessions.php