phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f6bf981bb945e0dafeca77351d4af06a' 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 ('f6bf981bb945e0dafeca77351d4af06a', -1, 1767339884, 1767339884, 'd849d819', 2, 0, 0)

Line : 187
File : sessions.php