diff --git a/smack-core/src/main/java/org/jivesoftware/smack/util/ParserUtils.java b/smack-core/src/main/java/org/jivesoftware/smack/util/ParserUtils.java
index 8f67c5ccf..be526aaba 100644
--- a/smack-core/src/main/java/org/jivesoftware/smack/util/ParserUtils.java
+++ b/smack-core/src/main/java/org/jivesoftware/smack/util/ParserUtils.java
@@ -79,6 +79,7 @@ public class ParserUtils {
                     throws XmlPullParserException, IOException {
         XmlPullParser.Event event = parser.getEventType();
         while (!(event == XmlPullParser.Event.END_ELEMENT && parser.getDepth() == depth)) {
+            assert event != XmlPullParser.Event.END_DOCUMENT;
             event = parser.next();
         }
     }