| Index: Source/WebCore/rendering/RenderObjectChildList.cpp
 | 
| ===================================================================
 | 
| --- Source/WebCore/rendering/RenderObjectChildList.cpp	(revision 93488)
 | 
| +++ Source/WebCore/rendering/RenderObjectChildList.cpp	(working copy)
 | 
| @@ -84,8 +84,8 @@
 | 
|          // if we remove visible child from an invisible parent, we don't know the layer visibility any more
 | 
|          RenderLayer* layer = 0;
 | 
|          if (owner->style()->visibility() != VISIBLE && oldChild->style()->visibility() == VISIBLE && !oldChild->hasLayer()) {
 | 
| -            layer = owner->enclosingLayer();
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| -            layer->dirtyVisibleContentStatus();
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| +            if ((layer = owner->enclosingLayer()))
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| +                layer->dirtyVisibleContentStatus();
 | 
|          }
 | 
|  
 | 
|           // Keep our layer hierarchy updated.
 | 
| 
 |