phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '304635e711471b8920fe7acdb0926396' 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 ('304635e711471b8920fe7acdb0926396', -1, 1770190062, 1770190062, 'd849d8b9', 1, 0, 0)

Line : 187
File : sessions.php