phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('19fe021838b9d95c1da2c441e8233d73', -1, 1755741084, 1755741084, 'ac120004', 3, 0, 0)

Line : 187
File : sessions.php