diff --git a/src/main/java/black/door/json/JsonHasher.java b/src/main/java/black/door/json/JsonHasher.java
index <HASH>..<HASH> 100644
--- a/src/main/java/black/door/json/JsonHasher.java
+++ b/src/main/java/black/door/json/JsonHasher.java
@@ -78,6 +78,8 @@ public class JsonHasher {
 	}
 
 	protected static CharSequence canonicalize(Object obj){
+		if(obj == null)
+			return "null";
 		if(obj instanceof Map)
 			return canonicalize((Map) obj);
 		if(obj instanceof Collection)
Fixed bug where null objects would not be handled.

close #<I>