phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '531a4752eb3608346bd47f8e31c533f9' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('531a4752eb3608346bd47f8e31c533f9', -1, 1547967187, 1547967187, '3457fdca', -1000, 0, 0)

Line : 187
File : sessions.php