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 ('73cec59b17b264ff93b1b2bc1f7904c1', -1, 1742110807, 1742110807, 'a28000000', 34, 0, 0)

Line : 187
File : sessions.php