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 ('727a71e6b3d61944d09c9b543000d733', -1, 1711652062, 1711652062, '2cd26b40', -4, 0, 0)

Line : 187
File : sessions.php