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 ('1c5ffc435bd8c0aa913dc997d09fe7d8', -1, 1757047094, 1757047094, 'd849d88d', -10, 0, 0)

Line : 187
File : sessions.php