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 ('f20bd8113c9f5b858d2e6e6abcbd08ab', -1, 1711621016, 1711621016, '641a236f', -9, 0, 0)

Line : 187
File : sessions.php