if (type != winNormalAtom)
return type;
- XQueryTree (dpy, w, &root_return, &parent_return, &children, &nchildren);
+ if (!XQueryTree (dpy, w, &root_return, &parent_return, &children,
+ &nchildren))
+ {
+ /* XQueryTree failed. */
+ return winNormalAtom;
+ }
+
for (i = 0;i < nchildren;i++)
{
type = determine_wintype (dpy, children[i]);