Cannot read properties of null (reading 'top')

[eltongonc]

While running some tests I run into the following error:

TypeError: The following error originated from your application code, not from Cypress.

  > [My-app]Cannot read properties of null (reading 'top')

When Cypress detects uncaught errors originating from your application it will automatically fail the current test.

This behavior is configurable, and you can choose to turn this off by listening to the `uncaught:exception` event.

Looking deeper into the error I notice the issue comes from the
this.selectedElementRect.top in the else statement in the code below:

//  ngx-guided-tour/projects/ngx-guided-tour/src/lib/guided-tour.component.ts

scrollToAndSetElement() {
    this.updateStepLocation();
    // Allow things to render to scroll to the correct location
    setTimeout(() => {
      if (!this.isOrbShowing && !this.isTourOnScreen()) {
        if (this.selectedElementRect && this.isBottom()) {
          // Scroll so the element is on the top of the screen.
          const topPos = this.windowRef.nativeWindow.scrollY + this.selectedElementRect.top - this.topOfPageAdjustment - (this.currentTourStep.scrollAdjustment ? this.currentTourStep.scrollAdjustment : 0) + this.getStepScreenAdjustment();
          try {
            this.windowRef.nativeWindow.scrollTo({
              left: null,
              top: topPos,
              behavior: 'smooth'
            });
          } catch (err) {
            if (err instanceof TypeError) {
              this.windowRef.nativeWindow.scroll(0, topPos);
            } else {
              throw err;
            }
          }
        } else {
          // Scroll so the element is on the bottom of the screen.
          const topPos = this.windowRef.nativeWindow.scrollY + this.selectedElementRect.top + this.selectedElementRect.height - this.windowRef.nativeWindow.innerHeight + (this.currentTourStep.scrollAdjustment ? this.currentTourStep.scrollAdjustment : 0) - this.getStepScreenAdjustment();
          try {
            this.windowRef.nativeWindow.scrollTo({
              left: null,
              top: topPos,
              behavior: 'smooth'
            });
          } catch (err) {
            if (err instanceof TypeError) {
              this.windowRef.nativeWindow.scroll(0, topPos);
            } else {
              throw err;
            }
          }
        }
      }
    });
  }