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 ('13793bdb72a0720c346ca6bc1adb3c62', -1, 1560710956, 1560710956, '22e57e1d', 4, 0, 0)

Line : 191
File : sessions.php