Add null check to m_layoutObject->parent() in AXLayoutObject.cpp

third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp

 /*
 * Copyright (C) 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 1599 matching lines @@
         while (lastChildHasContinuation(lastParent))
             lastParent = endOfContinuations(lastParent->slowLastChild())->parent();
         nextSibling = lastParent->nextSibling();
     } else if (LayoutObject* ns = m_layoutObject->nextSibling()) {
         // Case 3: node has an actual next sibling
         nextSibling = ns;
     } else if (isInlineWithContinuation(m_layoutObject)) {
         // Case 4: node is an inline with a continuation. Next sibling is the next sibling of the end
         // of the continuation chain.
         nextSibling = endOfContinuations(m_layoutObject)->nextSibling();
-    } else if (isInlineWithContinuation(m_layoutObject->parent())) {
+    } else if (m_layoutObject->parent() && isInlineWithContinuation(m_layoutObject->parent())) {
         // Case 5: node has no next sibling, and its parent is an inline with a continuation.
         LayoutObject* continuation = toLayoutInline(m_layoutObject->parent())->continuation();
 
         if (continuation->isLayoutBlock()) {
             // Case 5a: continuation is a block - in this case the block itself is the next sibling.
             nextSibling = continuation;
         } else {
             // Case 5b: continuation is an inline - in this case the inline's first child is the next sibling.
             nextSibling = firstChildConsideringContinuation(continuation);
         }
@@ skipping 892 matching lines @@
         if (label && label->layoutObject()) {
             LayoutRect labelRect = axObjectCache().getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace blink