phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b1d1d1cf6fa6181581d05108df0c3f37' for key 1

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('b1d1d1cf6fa6181581d05108df0c3f37', -1, 1498398691, 1498398691, '3650153d', 8, 0, 0)

Line : 187
File : sessions.php