homebox_build_title() creates error for anonymous user

I'm not sure why the array call for ['user']->name exists here but removing it from that line gets rid of the log message and doesn't create any new ones that I've found yet.

/**
 * Menu title callback.
 */
function homebox_build_title($title) {
-  return t(check_plain($title), array('@user' => $GLOBALS['user']->name));
+  return t(check_plain($title));
}

I think your solution would work great. Or maybe checking if a user name exists before returning the title?

/**
 * Menu title callback.
 */
function homebox_build_title($title) {
+ $name = $GLOBALS['user']->name;
+ if (!empty($name)):
-   return t(check_plain($title), array('@user' => $GLOBALS['user']->name));
+  return t(check_plain($title) array('@user' => $name));
+ else:
+  return t(check_plain($title);
+ endif;
}

The main point I think is that Anonymous is not being taken into account with this function and should be.