phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO forum_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('5a7597645823150df463ae2b2ced601e', -1, 1540215949, 1540215949, '36e11a2c', 2, 0, 0)

Line : 187
File : sessions.php