investigate potential safety number change bug

saw this in the logs over the weekend:

	2020-09-12 19:19:18	
[dispatcher | 2020-09-12T23:19:18.181Z] 
	
2020-09-12 19:19:17	
    at Pipe.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)
	
2020-09-12 19:19:17	
    at Socket.Readable.push (_stream_readable.js:224:10)
	
2020-09-12 19:19:17	
    at readableAddChunk (_stream_readable.js:265:13)
	
2020-09-12 19:19:17	
    at addChunk (_stream_readable.js:288:12)
	
2020-09-12 19:19:17	
    at Socket.emit (events.js:198:13)
	
2020-09-12 19:19:17	
    at Socket.sock.on.msg (/signalboost/app/socket/index.js:57:39)
	
2020-09-12 19:19:17	
    at Object.dispatch (/signalboost/app/dispatcher/index.js:76:13)
	
2020-09-12 19:19:17	
    at Object.handle (/signalboost/app/signal/callbacks.js:97:3)
	
2020-09-12 19:19:17	
    at _handleSendResponse (/signalboost/app/signal/callbacks.js:105:31)
	
2020-09-12 19:19:17	
TypeError: Cannot destructure property `identityFailure` of 'undefined' or 'null'.