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#0  0x00007ffff052c95a in std::unique_ptr<WebCore::AXComputedObjectAttributeCache, std::default_delete<WebCore::AXComputedObjectAttributeCache> >::get (this=0xd0) at /usr/include/c++/4.7/bits/unique_ptr.h:223
#1  0x00007ffff055b056 in WebCore::AXObjectCache::computedObjectAttributeCache (this=0x0) at /home/michal/source/WebKit/Source/WebCore/accessibility/AXObjectCache.h:211
#2  0x00007ffff0559b22 in WebCore::AccessibilityObject::accessibilityIsIgnored (this=0x776e80) at /home/michal/source/WebKit/Source/WebCore/accessibility/AccessibilityObject.cpp:2105
#3  0x00007ffff0559820 in WebCore::AccessibilityObject::notifyIfIgnoredValueChanged (this=0x776e80) at /home/michal/source/WebKit/Source/WebCore/accessibility/AccessibilityObject.cpp:2018
#4  0x00007ffff052a3f4 in WebCore::AXObjectCache::recomputeIsIgnored (this=0x813b20, renderer=0x82ebb0) at /home/michal/source/WebKit/Source/WebCore/accessibility/AXObjectCache.cpp:905
#5  0x00007ffff0fab3da in WebCore::RenderBlock::deleteLines (this=0x82ebb0) at /home/michal/source/WebKit/Source/WebCore/rendering/RenderBlock.cpp:920
#6  0x00007ffff0fe2795 in WebCore::RenderBlockFlow::deleteLines (this=0x82ebb0) at /home/michal/source/WebKit/Source/WebCore/rendering/RenderBlockFlow.cpp:1906
#7  0x00007ffff0fabce6 in WebCore::RenderBlock::collapseAnonymousBoxChild (parent=0xa1cba0, child=0x82ebb0) at /home/michal/source/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1084
#8  0x00007ffff0fac171 in WebCore::RenderBlock::removeChild (this=0xa1cba0, oldChild=...) at /home/michal/source/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1160

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