Application crashes when selecting a Narrative in documentation example

[francamps]

Narratives makes application crash when following documentation for Timemap + Datasheet.

Environment

In local development.
For data source, I'm running the datasheet locally with the example sheet in https://github.com/forensic-architecture/datasheet-server/blob/main/data/timemap_data.xlsx, which contains some example narratives.

In timemap, I'm rendering everything correctly. However, when going into narratives, the application crashes (black screen).
I've cloned the repo from the latest commit (32feff8) .

Current Behavior

When opening the menu by clicking on Narratives on the left tool bar and clicking on one of the examples, the application goes black and crashes.

The following line is missing a check on load:
https://github.com/forensic-architecture/timemap/blob/main/src/components/CardStack.jsx#L29

const cardScroll = this.refs[this.props.narrative.current].current

This line finds this.props.narrative undefined, and so crashes.

Expected Behavior

If undefined, handle gracefully.