Cannot read property 'replace'

[walmer-bolfet]

My Homebridge is crashing periodically - at least once a day. I don't know exactly when, or if it is assocated with a current action. When I check on it I see the following and expect it is related to Applescript. Anyone have any ideas about what to do?

/usr/local/lib/node_modules/homebridge-applescript/index.js:24
var command = accessory[prop].replace(/''/g, '"');

TypeError: Cannot read property 'replace' of undefined
at ApplescriptAccessory.setState (/usr/local/lib/node_modules/homebridge-applescript/index.js:24:31)
at emitThree (events.js:97:13)
at emit (events.js:175:7)
at Characteristic.setValue (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Characteristic.js:152:10)
at Bridge.Accessory._handleSetCharacteristics (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Accessory.js:516:22)
at emitThree (events.js:97:13)
at HAPServer.emit (events.js:175:7)
at HAPServer._handleCharacteristics (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/HAPServer.js:682:10)
at HAPServer. (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/HAPServer.js:172:39)
at emitNone (events.js:67:13)
at IncomingMessage.emit (events.js:166:7)
at endReadableNT (_stream_readable.js:905:12)
at doNTCallback2 (node.js:441:9)
at process._tickCallback (node.js:355:17)