phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'dbc8bf96a97136512994df071b959fb4' 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 ('dbc8bf96a97136512994df071b959fb4', -1, 1779929154, 1779929154, 'd849d9ad', -9, 0, 0)

Line : 187
File : sessions.php