phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c08b1a8e01f94d5c147281a6480b73bf' 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 ('c08b1a8e01f94d5c147281a6480b73bf', -1, 1770884629, 1770884629, 'd849d876', 6, 0, 0)

Line : 187
File : sessions.php