Basemap Gallery Widget at 4.4 - Can not read property 'destroy' of null

[PhilLarkin1]

I'm seeing an error when switching between basemaps using the gallery widget at 4.4.

ArcGIS JS v4, Calcite Maps and Bootstrap Example 

MapView.js:711 Uncaught TypeError: Cannot read property 'destroy' of null
at Object.b.detach (MapView.js:711)
at a._detachLayerView (MapView.js:35)
at Object.update (MapView.js:31)
at f._animationFrame (init.js:342)

[KenBuja]

I didn't experience that error when looking at the site in Chrome (59.0.3071.115), FF (54.0.1), IE (11.1358.14393.0), or Edge (38.14393.1066.0). Which browser are you using?

[PhilLarkin1 · Accepted solution]

The error no longer occurs for me. This might have been a temporary glitch during the 4.3 to 4.4 switch that took place yesterday.