phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'd7c31df98d960c5bacc7a0d75d5fffe3' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('d7c31df98d960c5bacc7a0d75d5fffe3', -1, 1766049450, 1766049450, 'd849d8d7', -4, 0, 0)

Line : 187
File : sessions.php