`_updateQSlider` should log a warning rather than raising an exception which is not caught resulting in interface crashes. https://github.com/TomographicImaging/eqt/blob/85349bc16dfc6fca64f19d0596cb0f162f0203e0/eqt/ui/UISliderWidget.py#L261 https://github.com/TomographicImaging/eqt/blob/85349bc16dfc6fca64f19d0596cb0f162f0203e0/eqt/ui/UISliderWidget.py#L266