phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '155e45d7636125fb7deb528fb779d452' 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 ('155e45d7636125fb7deb528fb779d452', -1, 1498528499, 1498528499, '36c6665c', 15, 0, 0)

Line : 187
File : sessions.php