Cannot read property 'prompt' of null

[DKhateek1372]

index.js:124 Uncaught TypeError: deferredPrompt.prompt is not a function
at heelo._this.addToHomeScreen (index.js:124)
at onClick (index.js:733)
at HTMLUnknownElement.callCallback (react-dom.development.js:336)
at Object.invokeGuardedCallbackDev (react-dom.development.js:385)
at invokeGuardedCallback (react-dom.development.js:440)
at invokeGuardedCallbackAndCatchFirstError (react-dom.development.js:454)
at executeDispatch (react-dom.development.js:584)
at executeDispatchesInOrder (react-dom.development.js:606)
at executeDispatchesAndRelease (react-dom.development.js:713)
at executeDispatchesAndReleaseTopLevel (react-dom.development.js:722)
at forEachAccumulated (react-dom.development.js:694)
at runEventsInBatch (react-dom.development.js:739)
at runExtractedPluginEventsInBatch (react-dom.development.js:880)
at handleTopLevel (react-dom.development.js:5807)
at batchedEventUpdates$1 (react-dom.development.js:24368)
at batchedEventUpdates (react-dom.development.js:1419)
at dispatchEventForPluginEventSystem (react-dom.development.js:5898)
at attemptToDispatchEvent (react-dom.development.js:6014)
at dispatchEvent (react-dom.development.js:5918)
at unstable_runWithPriority (scheduler.development.js:818)
at runWithPriority$2 (react-dom.development.js:12130)
at discreteUpdates$1 (react-dom.development.js:24384)
at discreteUpdates (react-dom.development.js:1442)
at dispatchDiscreteEvent (react-dom.development.js:5885)