phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '780b6bc9e2412baf98d4a62752122bda' 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 ('780b6bc9e2412baf98d4a62752122bda', -1, 1770184129, 1770184129, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php