The interesting thing is that there is no nulls in output. If it were
null I probably could see this error in GWT Shell, but in hosted
browser everyting was ok. The following code also gives me same error:
    @Override
    public String toString() {
        //return "" + getValue();
        return getValue() == null ? "" : getValue().toString();
    }

I'm using GWT 1.5.2, I'll try to swith to newer version some day and
check if this error will still appear.
Anyway, it works with "" + getValue() by now.

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