The dtor has to be called correctly.

src/html.cc

@@ -555,7 +555,7 @@ DilloHtml::~DilloHtml()
       DilloHtmlImage *img = images.at(i);
       img->url.reset(); // Was: delete img->url;
       img->image.reset(); // Was: a_Image_unref(img->image);
-      dFree(img);
+      delete img;
    }
    images.clear();
 }