PLT-6561 Fixing javascript issue on compliance report (#6387)

webapp/components/audit_table.jsx

@@ -378,7 +378,10 @@ export function formatAuditInfo(audit, formatMessage) {
 
                 if (userIdField.indexOf('user_id') >= 0) {
                     userId = userIdField[userIdField.indexOf('user_id') + 1];
-                    username = UserStore.getProfile(userId).username;
+                    var profile = UserStore.getProfile(userId);
+                    if (profile) {
+                        username = profile.username;
+                    }
                 }
             }