Game getting freezed but with different reason

Armory Engine General
1

Game getting freezed and it give me this error in console.

Finished in 7.948609352111816
Falling back to the system's preferred WASAPI mix format.
Uncaught exception:
                                if(rigidBody.object.name == "City") {
                                ^
TypeError
   at Anonymous function (krom.js:378:5)
   at iron_App.update (krom.js:3955:3)
   at Anonymous function (krom.js:26465:3)
   at kha_Scheduler.executeTimeTasks (krom.js:26349:4)
   at kha_Scheduler.executeFrame (krom.js:26301:3)
   at kha_SystemImpl.renderCallback (krom.js:27173:2)