phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a5db470d50f5b50e883b4d96ae522a9b' 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 ('a5db470d50f5b50e883b4d96ae522a9b', -1, 1770631174, 1770631174, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php