Fixed previous commit.

js/boot.js

@@ -55,7 +55,7 @@ function Smalltalk(){
        should be added to the smalltalk object, see smalltalk.addClass().
        Superclass linking is *not* handled here, see smalltalk.init()  */
 
-    klass = function(spec) {
+    function klass(spec) {
 	var spec = spec || {};
 	var that;
 	if(spec.meta) {
@@ -209,13 +209,13 @@ function Smalltalk(){
        if the receiver has no klass, we consider it a JS object (outside of the
        Jtalk system). Else assume that the receiver understands #doesNotUnderstand: */
 
-    messageNotUnderstood = function(receiver, selector, args) {
+    function messageNotUnderstood(receiver, selector, args) {
 	/* Handles JS method calls. Assumes that a single array or single argument was passed from Jtalk.
 	   Example: someJSObject foo: #(1 2 3) -> someJSObject.foo(1,2,3); */
 	var jsFunction = receiver[selector.replace(/_/g, '')];
 	var jsArguments;
 	if(receiver.klass === undefined && typeof jsFunction === "function") {
-	    if(args[0].constructor === Array) {
+	    if(args[0] && args[0].constructor === Array) {
 		jsArguments = args[0]
 	    } else {
 		jsArguments = [args[0]]
@@ -225,6 +225,8 @@ function Smalltalk(){
 
 	/* Handles not understood messages. Also see the Jtalk counter-part 
 	   Object>>doesNotUnderstand: */
+	if(!receiver.klass) {throw(receiver + ' is not a Jtalk object')}
+	
 	return receiver._doesNotUnderstand_(
 	    st.Message._new()
 		._selector_(convertSelector(selector))
@@ -236,7 +238,7 @@ function Smalltalk(){
        if you modify the following functions, also change String>>asSelector
        accordingly */
 
-    convertSelector = function(selector) {
+    function convertSelector(selector) {
 	if(selector.match(/__/)) {
 	    return convertBinarySelector(selector);
 	} else {
@@ -244,11 +246,11 @@ function Smalltalk(){
 	}
     };
 
-    convertKeywordSelector = function(selector) {
+    function convertKeywordSelector(selector) {
 	return selector.replace(/^_/, '').replace(/_/g, ':');
     };
 
-    convertBinarySelector = function(selector) {
+    function convertBinarySelector(selector) {
 	return selector
 	    .replace(/^_/, '')
 	    .replace(/_plus/, '+')
@@ -301,6 +303,7 @@ var nil = new SmalltalkNil();
 var smalltalk = new Smalltalk();
 var thisContext = nil;
 
+
 /****************************************************************************************/