Removal of CzmlDataSource from Viewer breaks the Viewer

I am using Cesium to display a subset of the Iridium Next constellation, and I am loading sats via the following:

// satData is the valid CZML sent from the backend over the socket
viewer.dataSources.add(Cesium.CzmlDataSource.load(satData)).then(function (datasource) {
                    ds = datasource;
                });

and then I am attempting to remove it when the socket that sent the satData dies as such:

if (viewer.dataSources.contains(ds)) {
            // satData represent whichever data was past to the frontend from the socket that just disconnected
            var removalPromise = viewer.dataSources.remove(ds);
            Cesium.when(removalPromise, function() { console.log('The promise has resolved') });
}

When I get here, ONLY WHEN THERE ARE MULTIPLE SATS IN THE VIEWER (ala satData1, satData2, etc) I get the following error:

DeveloperError: This object was destroyed, i.e., destroy() was called. Error at new DeveloperError  
 (webpack:///./node_modules/cesium/Source/Core/DeveloperError.js?:43:19) at  
 PolylineCollection.throwOnDestroyed (webpack:///./node_modules/cesium/Source/Core/destroyObject.js?:45:19) at
 PrimitiveCollection.update 
 
(webpack:///./node_modules/cesium/Source/Scene/PrimitiveCollection.js?:368:27) at PrimitiveCollection.update  
 
(webpack:///./node_modules/cesium/Source/Scene/PrimitiveCollection.js?:368:27) at PrimitiveCollection.update 
  
(webpack:///./node_modules/cesium/Source/Scene/PrimitiveCollection.js?:368:27) at  
 
updateAndRenderPrimitives (webpack:///./node_modules/cesium/Source/Scene/Scene.js?:2936:27) at  
 
executeCommandsInViewport (webpack:///./node_modules/cesium/Source/Scene/Scene.js?:2775:13) at  
 updateAndExecuteCommands (webpack:///./node_modules/cesium/Source/Scene/Scene.js?:2583:13) 
  
at render (webpack:///./node_modules/cesium/Source/Scene/Scene.js?:3223:9) at tryAndCatchError  
 (webpack:///./node_modules/cesium/Source/Scene/Scene.js?:3243:13)

Apologies for the weird line breaks. Thanks for the help!

[icarter09]

I have verified I’m calling viewer.dataSources.remove with the correct argument and it’s not trying to be removed twice. I’ll try to get an example put together at some point.

[Trylor]

Please look at this example error. It is loading 2 different czmls. A setTimeout is set and will run removeAll() and error. If only one czml is added (the other is commented out) removeAll works fine, as does the individual remove(). I’ve been trying to fix/circumvent this for hours since I’m handcuffed by it. For my application, I’m trying to load and at times remove multiple, much larger czmls and it is necessary I free up memory instead of just hiding them. I believe it has something to do with the time ranges/clock. Because, when I add another czml without time ranges/clock, removeAll() works with that and just one of these timed czmls. I’ve tried removing various parts of the 2nd czml to pursue that theory and still can’t get it to work.

Sandcastle Example