Error -10003 encountered while saving. Error: java.lang.NullPointerException invoking method Save (Doc ID 1467421.1)

When saving an asset of a particular assettype, the UI displays the following error message:

"Error -10003 encountered while saving. Error: java.lang.NullPointerException invoking method Save"

And the futuretense.txt log file from that time has the following error and stacktrace:

[CS.FRAMEWORK][ERROR] Error: java.lang.NullPointerException invoking method Save
java.lang.NullPointerException
at com.openmarket.basic.event.SearchAssetIdEventListener._processEntry(y:313)
at com.openmarket.basic.event.SearchAssetIdEventListener.assetUpdated(y:1225)
at com.openmarket.basic.event.AbstractAssetEventListener.onEvent(y:776)
at com.openmarket.basic.event.AbstractAssetEventListener.onEvent(y:409)
at com.fatwire.cs.core.event.SimpleDispatcher.dispatchBlocking(y:2313)
at com.fatwire.cs.core.event.SimpleDispatcher.dispatchEvent(y:3086)
at com.openmarket.xcelerate.asset.Asset._fireAssetSaveEvent(y:13906)
at com.openmarket.xcelerate.asset.Asset.SaveAll(y:5357)
at com.openmarket.assetframework.complexasset.ComplexAsset.superSaveAll(y:3015)
at com.openmarket.assetframework.complexasset.AssetManager.saveAll(y:2235)
at com.openmarket.assetframework.common.BulkTransactionalAssetManager.save(y:1683)
at com.openmarket.assetframework.complexasset.ComplexAsset.Save(y:3478)
at com.openmarket.xcelerate.asset.Asset.Save(y:2386)

Cause

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