Executing command error when the revit application have not document

[MauNguyenVan]

When addin opened, then the user close all documents and click run a command on the addin. The error will occur like this below video Thanks.

https://user-images.githubusercontent.com/48544354/156809579-10607bca-8917-40d5-8308-28dcb1299e41.mp4

[chuongmep]

Thanks for your report , fixed