|  | @@ -212,7 +212,8 @@ function Smalltalk(){
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				|  |  |      function messageNotUnderstood(receiver, selector, args) {
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				|  |  |  	/* Handles JS method calls. Assumes that a single array or single argument was passed from Jtalk.
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				|  |  |  	   Example: someJSObject foo: #(1 2 3) -> someJSObject.foo(1,2,3); */
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				|  |  | -	var jsFunction = receiver[selector.replace(/_/g, '')];
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				|  |  | +	var jsSelector = selector.replace(/_/g, '');
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				|  |  | +	var jsFunction = receiver[jsSelector];
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				|  |  |  	var jsArguments;
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				|  |  |  	if(receiver.klass === undefined && typeof jsFunction === "function") {
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				|  |  |  	    if(args[0] && args[0].constructor === Array) {
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				|  | @@ -225,7 +226,7 @@ function Smalltalk(){
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				|  |  |  
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				|  |  |  	/* Handles not understood messages. Also see the Jtalk counter-part 
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				|  |  |  	   Object>>doesNotUnderstand: */
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				|  |  | -	if(!receiver.klass) {throw(receiver + ' is not a Jtalk object')}
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				|  |  | +	if(!receiver.klass) {throw(receiver + ' is not a Jtalk object and ' + jsSelector + ' is not a function')}
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				|  |  |  	
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				|  |  |  	return receiver._doesNotUnderstand_(
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				|  |  |  	    st.Message._new()
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