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)
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.
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?
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