phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6a0c90da53414b4cddda3ab0c48857f5' 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 ('6a0c90da53414b4cddda3ab0c48857f5', -1, 1770103663, 1770103663, 'd849d8b9', 1, 0, 0)

Line : 187
File : sessions.php