Multiple selection causing application crash

I'm having an issue with the Scintilla controller used in my application. 
My freeware app <https://clipboard.quickaccesspopup.com> is developed in 
AutoHotkey v1.1. In the beta release where I am implementing Scintilla, I 
use the DLL v3.7.6 found with the "Adventure IDE" project (mentioned here 
<https://groups.google.com/g/scintilla-interest/c/6scTFGX59FY/m/Cde4zaARBgAJ>
).

My issue: The app is launching correctly and works normally but, at some 
point, it closes unexpectedly. As far as I can tell, the crashes always 
occur when:

- multiple selection is enabled
- at least two portions of text are selected
- only if at least one selection is long enough (a few hundred chars)
- I scroll down in the window

The crashes occurs as I'm scrolling down. The app simply close after a 
short freeze.

Do you have any advise on how I could find what causes this issue?

Thank you for your support!

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