phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '872189d762717020855b4d170902b711' for key 1

INSERT INTO sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('872189d762717020855b4d170902b711', -1, 1472082947, 1472082947, '3650b208', 30, 0, 0)

Line : 187
File : sessions.php