diff --git a/web/app/assets/javascripts/download_jamtrack.js.coffee b/web/app/assets/javascripts/download_jamtrack.js.coffee
index f98598fba..244466b83 100644
--- a/web/app/assets/javascripts/download_jamtrack.js.coffee
+++ b/web/app/assets/javascripts/download_jamtrack.js.coffee
@@ -350,6 +350,10 @@ context.JK.DownloadJamTrack = class DownloadJamTrack
       context.jamClient.InvalidateJamTrack(@jamTrack.id)
       @trackDetail = context.jamClient.JamTrackGetTrackDetail (@jamTrack.id)
 
+      if @jamTrack.version != @trackDetail.version
+        @logger.error("after invalidating package, the version is still wrong!")
+        throw "after invalidating package, the version is still wrong!"
+
     switch @trackDetail.key_state
       when 'pending'
         this.transition(@states.keying)