phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a7d8040cc3f178e070dd197f7775e40a' 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 ('a7d8040cc3f178e070dd197f7775e40a', -1, 1778811162, 1778811162, 'd849d93d', -4, 0, 0)

Line : 187
File : sessions.php