diff --git a/parser.c b/parser.c
index 77a12f5..4f54794 100644
--- a/parser.c
+++ b/parser.c
@@ -605,6 +605,10 @@
     ctxt->str_xml = xmlDictLookup(ctxt->dict, BAD_CAST "xml", 3);
     ctxt->str_xmlns = xmlDictLookup(ctxt->dict, BAD_CAST "xmlns", 5);
     ctxt->str_xml_ns = xmlDictLookup(ctxt->dict, XML_XML_NAMESPACE, 36);
+    if ((ctxt->str_xml==NULL) || (ctxt->str_xmlns==NULL) || 
+    		(ctxt->str_xml_ns == NULL)) {
+        xmlErrMemory(ctxt, NULL);
+    }
 }
 
 typedef struct _xmlDefAttrs xmlDefAttrs;