Reloading data with Load File problems

[JakubChecinski]

Describe the bug
Reloading data from file using Load File button causes the app to crash if selected yes. If selected no, it still opens the reloading window.

Data: Example 0200nm

To Reproduce
Steps to reproduce the behavior:

1. Load data from directory
2. Set a widget like 2D_Layer and try to record animation (this is important, without this step the bug will not occur)
3. Click on File ->Load File
4. The "You may loose calculation!" message appears (btw, shouldn't it be "lose"?)
   5a) Click no -> the program still deletes current widget and asks which data to use
   5b) Click yes -> the app crashes (see screenshot for error message)

Screenshots
https://imgur.com/JDeSvt8