Customer observing strange behaviour with QAxBase::isNull() from qaxbase.cpp

Customer claims that this function returns unexpected return values. Actual text here:

“They have a question about the function QAxBase::isNull()

The documentation tells that it "Returns true if there is no COM object loaded by this wrapper; otherwise return false." In their opinion this is the contrary (ie. it returns false if there is no COM object loaded).
They have made tests with a QAxObject object. The function returns false at startup, then they initialize a COM object with the function setControl(), and the function returns true.

Do They misunderstand something, or could the documentation contain a mistake ? “

 The location of the cpp file is:

qtactiveqt/src/activeqt/container/qaxbase.cpp

//
bool QAxBase::isNull() const {
     return !d->ptr;
}
 
 //
 

what happens when we return !sixty_four_bit_pointer as a bool?

seems kind of iffy.

I would be more comfortable with something like

if(d->ptr){
    return false;
    }
return true;