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 ('81e33aec67f2ebb87f2f3159228be41c', -1, 1713920077, 1713920077, '12e318d1', -4, 0, 0)

Line : 187
File : sessions.php