phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f7e1cbbccc608c1f4d5597933da7269f' 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 ('f7e1cbbccc608c1f4d5597933da7269f', -1, 1441198129, 1441198129, '36c4afad', 18, 0, 0)

Line : 187
File : sessions.php