Scrolling down causes the editor to crash

[BattleMage0231]

When editing a long file (~800 lines), the editor crashes when you spam the down arrow key to scroll down. This will first bring the caret back up to the first line for some reason, and when you scroll back down again the editor will crash with the following message.

A fatal error has occured.

Exited the editor.
A fatal error has occured.

Exited the editor.