DayPlanner Error: Cannot read properties of null (reading 'children')

What I’m trying to do

I don’t think my DayPlanner plugin is working correctly. I get the following error when I view the console:

app.js:1 Uncaught (in promise) TypeError: Cannot read properties of null (reading 'children')
    at t.getSideLeaf (app.js:1:2222985)
    at t.getRightLeaf (app.js:1:2221766)
    at DayPlanner.initTimelineLeafSilently (plugin:obsidian-day-planner:49428:32)
    at async DayPlanner.onload (plugin:obsidian-day-planner:49464:5)

All my linked calendars appear to be working fine, but I keep seeing this error and I wonder if something isn’t loading properly. I’ve tried searching for this error on DayPlanner, but I can’t find anything quite like it in the forums. Help?