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 ('c5815e07ac2d1a47c300f301bcdd0b58', -1, 1635314400, 1635314400, '23af6b4d', -7, 0, 0)

Line : 187
File : sessions.php