phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '34941adddfa3c1375b6cfd6043fb66cd' 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 ('34941adddfa3c1375b6cfd6043fb66cd', -1, 1490470733, 1490470733, '36a652a1', 17, 0, 0)

Line : 187
File : sessions.php