diff --git a/smalivm/src/main/java/org/cf/smalivm/MethodReflector.java b/smalivm/src/main/java/org/cf/smalivm/MethodReflector.java
index a3b19edd5..8d10477c7 100644
--- a/smalivm/src/main/java/org/cf/smalivm/MethodReflector.java
+++ b/smalivm/src/main/java/org/cf/smalivm/MethodReflector.java
@@ -129,8 +129,10 @@ private InvocationArguments getArguments(MethodState mState) throws ClassNotFoun
                 if (argItem.isPrimitiveOrWrapper()) {
                     arg = Utils.castToPrimitive(arg, parameterTypeName);
                 } else {
-                    if (arg instanceof Number && argItem.getIntegerValue() == 0) {
-                        // Passing 0 as a non-primitive type means it's null (thanks Dalvik)
+                    if (arg instanceof Number && argItem.getIntegerValue() == 0 && !parameterTypeName
+                                    .equals("Ljava/lang/Object;")) {
+                        // TODO: medium - how the hell does Dalvik really know if it's a null or a 0?
+                        // Passing 0 as a non-primitive type *COULD* it's null (thanks Dalvik)
                         arg = null;
                     }
                 }