phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO r2ok_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('bf22b682685d70dd519aa0e71345f124', -1, 1524227056, 1524227056, '36506778', 2, 0, 0)

Line : 187
File : sessions.php