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 ('4b42d1f62e55b41d20f9e0f15df361af', -1, 1714609773, 1714609773, '1274086e', -50, 0, 0)

Line : 187
File : sessions.php