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 ('08421d615bf33b46f30b9b11691a1278', -1, 1710826393, 1710826393, '035fe96b', -4, 0, 0)

Line : 187
File : sessions.php