phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '56d4ac7c904e27422c3c799738e32dff' 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 ('56d4ac7c904e27422c3c799738e32dff', -1, 1770519890, 1770519890, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php