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 ('f4a67b51f59ef0e7e3730e651a8fad3d', -1, 1713862809, 1713862809, '0395d620', 0, 0, 0)

Line : 187
File : sessions.php