diff --git a/jode/jode/type/NullType.java b/jode/jode/type/NullType.java
index 542f067..1521b66 100644
--- a/jode/jode/type/NullType.java
+++ b/jode/jode/type/NullType.java
@@ -78,6 +78,8 @@ public class NullType extends ReferenceType {
      * @return the intersection, or tError, if a type conflict happens.
      */
     public Type intersection(Type type) {
-	throw new AssertError("NULL.intersection");
+	if (type == this)
+	    return type;
+	return tError;
     }
 }