Block multiple download.

Normand Briere

2019-10-05 8768a855af9ccc482a9520ce708ef32e0e6e0e7d

 Composite.java
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@@ -286,6 +286,8 @@
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         for (int i = 0; i < Children().size(); i++)
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         {
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             Object3D obj = (Object3D) Children().reserve(i);
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+            if (obj == null)
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+                continue;
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             compo.addChild(obj.copyExpand());
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             Children().release(i);
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         }