Error trying to join FP game in progress

I was just selected (for the 3rd or 4th time) to join the FP. In the past, I could never find FP games to join so I always got "unselectd" from FP. This time I found a game, joined, but when I went to play it, I got this message:

*************************

newArmy.isRemoved is not a function

TypeError: newArmy.isRemoved is not a function

at ultshared.UltArmyState.mergeArmies (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:36202:22)

at ultshared.UltArmyState.update (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:36182:10)

at ultshared.UltGameState.update (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:46599:36)

at hup.GameStateHandler.updateInitialGamestate (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:48955:19)

at hup.GameStateHandler.onMessage (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:48891:14)

at Subscriber.notify (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:323:7)

at Object.publish (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:397:33)

at lzr.AjaxServer.lzr.Server.onMessage (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:3059:14)

at lzr.AjaxServer.onMessage (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:3171:36)

at hup.ui.SplashScreenWidget.onSuccess (http://www.callofwar.com/ww2-dev/js/main-built-min.js?bust=1484498620:31988:14)

Details:

TypeError: newArmy.isRemoved is not a function

**************************

This was for game 1,773,983.

I'd really like to do the FP stuff, but never seem to be able to get it to work.

Thanks