When <code>removeAttributeNS()</code> is called, if the node contains other
attributes having no explicit namespace, there is a segmentation fault at
<code>dom.c/domRemoveAttributeNS</code>, which in line 3243 assumes the
existence of a namespace.   Here is a patch:

<code><verbatim>
--- generic/dom.c
+++ generic/dom.c
@@ -3238,11 +3238,11 @@
     attr = node->firstAttr;
     while (attr) {
         domSplitQName (attr->nodeName, prefix, &str);
         if (strcmp(localName,str)==0) {
             ns = domGetNamespaceByIndex(node->ownerDocument, attr->namespace);
-            if (strcmp(ns->uri, uri)==0) {
+            if (ns && strcmp(ns->uri, uri)==0) {
                 if (previous) {
                     previous->nextSibling = attr->nextSibling;
                 } else {
                     attr->parentNode->firstAttr = attr->nextSibling;
                 }
</verbatim></code>

Yes. Applied your fix. Thanks.