Answer:
Since null elements (t = 0, t *> 0) have no influence on the moments of inertia or section moduli, but are required for the calculation of shear areas, for example, the shear stresses can also be calculated on these elements.
The display or calculation of the stresses on null elements can be activated in the calculation parameters, as shown in Image 01. You can select whether the stresses are redistributed to the connected elements or displayed directly. Image 02 shows shear stresses on an example cross-section.