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 ('3814ce7fcc5b54486b3cec04292e8017', -1, 1524206745, 1524206745, '3650082c', 11, 0, 0)

Line : 187
File : sessions.php