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 ('29e5b3de4cc2af8a37bdcbef4987d9fa', -1, 1711668596, 1711668596, '035c60f7', -2, 0, 0)

Line : 187
File : sessions.php