phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c78ed209db3b743d49db763d1d78ddb4' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c78ed209db3b743d49db763d1d78ddb4', -1, 1766235580, 1766235580, '00000000', 29, 0, 0)

Line : 187
File : sessions.php