phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '51a8185af62d9ed5962e81b72333748f' 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 ('51a8185af62d9ed5962e81b72333748f', -1, 1770073016, 1770073016, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php