Bug 203384, document could be null, for example when calling from XPointer processor, patch from jst, r=sicking, sr=heikki, a=asa.

content/xslt/src/xpath/nsXPathEvaluator.cpp

@@ -77,7 +77,7 @@ nsXPathEvaluator::CreateExpression(const nsAString & aExpression,
                                    nsIDOMXPathExpression **aResult)
 {
     nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocument);
-    ParseContextImpl pContext(aResolver, doc->IsCaseSensitive());
+    ParseContextImpl pContext(aResolver, doc && doc->IsCaseSensitive());
     Expr* expression = ExprParser::createExpr(PromiseFlatString(aExpression),
                                               &pContext);
     if (!expression)