x is 'null' while it is asserted that it is some

[rroohhh]

open blank document -> click into it to see a cursor -> press i

[pajowu]

Source of the Error:

audapolis/app/src/state/editor/selectors.ts

Line 208 in 5738a57

assertSome(selection);

Cause by the transcript correction code assuming that it can create a selection if the current selection is empty

audapolis/app/src/state/editor/transcript_correction.ts

Lines 24 to 30 in 5738a57

	if (state.selection == null) {
	if (direction == 'right') {
	moveSelectionHeadRight.reducer(state);
	} else {
	moveSelectionHeadLeft.reducer(state);
	}
	}