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 ('5ca260adce66dc8fef168753d9fe4bcd', -1, 1713959616, 1713959616, '1276b8ed', -7, 0, 0)

Line : 187
File : sessions.php