phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6a75f8f83d8b519888f46ea2e06b01cc' for key 'PRIMARY'

INSERT INTO sub_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6a75f8f83d8b519888f46ea2e06b01cc', -1, 1768512127, 1768512127, 'd849d89f', -4, 0, 0)

Line : 187
File : sessions.php