The specs for the utility method javax.lang.model.util.Types.asElement(TypeMirror) says:
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Returns the element corresponding to a type.
The type may be a DeclaredType or TypeVariable.
Returns null if the type is not one with a corresponding element.
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However the method returns null if invoked with the ErrorType instance.

Such behavior looks contradicting to the specs because:
1. ErrorType extends DeclaredType
2. ErrorType does have a corresponding element which can be retrieved using:

        if (typeMirror.getKind() == TypeKind.ERROR) {
            element = ((ErrorType) typeMirror).asElement();
        }