Need help with my code

[A500]

I am making my first MUI application in AmiBlitz. The program is 98% complete except for deadly bugs that make this program not useable at all. I have declared all the necessary variables and correct orders for multiple windows, buttons, textbox and strings objects, including the menu system as well as starting the program.
 

My problem when the person attempts to quit the program or tries to open another file which closes everything and releases everything from memory before declaring them again and opening them again. It crashes here. I have pasted a screenshot of where the issue resides.

https://i.ibb.co/pvxqSKD/IMG-3541.jpg" alt="[Bild: IMG-3541.jpg]" class="mycode_img" />

[hackball]

Without seeing the actual code over time, with debugger etc.
i suggest to double check if you really release everything properly before creating the same object again; maybe you are keeping some of it that gets re-assigned to another group while being attached to the previous, now freed, group?