JavaScript not passing arguments το WindowScriptObject?

Question

First off, let me tell you that I've used webviews in Cocoa like 100 times. However, I have no clue as to what goes wrong...

Here's the JS part:

window.objc.log_("Selected Element!");

And here's the Objective-C part:

- (void)log:(NSString*)msg
{
    NSLog(@"JS: %@",msg);
}

And here's the output:

JS: (null)

What's going on?

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P.S. The WebView's windowScriptObject has been correctly set and isSelectorExcludedFromWebScript: and isKeyExcludedFromWebScript: have been defined. (The function wouldn't be called at all anyway, if they weren't set...)