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 ('da6d37a07d530e50b0d9b6fec5e61220', -1, 1711709254, 1711709254, '03ef0d01', -7, 0, 0)

Line : 187
File : sessions.php