phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8616f3b781ae4010e75d5a348f7811cf' 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 ('8616f3b781ae4010e75d5a348f7811cf', -1, 1770156898, 1770156898, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php