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 ('84320f0850bc8dc8441ab20c3a0a97bb', -1, 1711714441, 1711714441, '12e83e86', 2, 0, 0)

Line : 187
File : sessions.php