phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c87291b3ce69b3b8677b75c952cc178c' 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 ('c87291b3ce69b3b8677b75c952cc178c', -1, 1770114046, 1770114046, 'd849d805', 12, 0, 0)

Line : 187
File : sessions.php