phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f175bea78e4731e64fd3eba5f5d95937' 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 ('f175bea78e4731e64fd3eba5f5d95937', -1, 1770604896, 1770604896, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php