--- entities.c	2002/01/09 11:51:36	1.56
+++ entities.c	2002/01/24 01:50:26
@@ -350,7 +350,8 @@
 xmlGetDtdEntity(xmlDocPtr doc, const xmlChar *name) {
     xmlEntitiesTablePtr table;
 
-    if ((doc->extSubset != NULL) && (doc->extSubset->entities != NULL)) {
+    if ((doc != NULL) && (doc->extSubset != NULL) && 
+	    (doc->extSubset->entities != NULL)) {
 	table = (xmlEntitiesTablePtr) doc->extSubset->entities;
 	return(xmlGetEntityFromTable(table, name));
     }