phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c35a68361b0713b1fbc489e34ca67829', -1, 1532296522, 1532296522, '36c66fb9', 2, 0, 0)

Line : 187
File : sessions.php