phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f7a11fafbf3796c1d9e2f8978c7db547' 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 ('f7a11fafbf3796c1d9e2f8978c7db547', -1, 1770305280, 1770305280, 'd849d83c', 4, 0, 0)

Line : 187
File : sessions.php