phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '2f51f92d1f7fc52f1eec4bf6946c83e0' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('2f51f92d1f7fc52f1eec4bf6946c83e0', -1, 1534330748, 1534330748, '36c40506', 10, 0, 0)

Line : 198
File : sessions.php