phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '817697cc0a9f5cef13e4430cd0dab49e' 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 ('817697cc0a9f5cef13e4430cd0dab49e', -1, 1769088671, 1769088671, 'd849d8d9', 4, 0, 0)

Line : 187
File : sessions.php