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 ('9d1a4da4537d9d496738daef46f4e83d', -1, 1711632304, 1711632304, '22c91022', 2, 0, 0)

Line : 187
File : sessions.php