phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c7aa70867bd60700b142b76b55e64073' 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 ('c7aa70867bd60700b142b76b55e64073', -1, 1768256068, 1768256068, 'd849d81c', -4, 0, 0)

Line : 187
File : sessions.php