App crash when we use multiple webview interface with multiple webview

> Fatal Exception: com.tns.NativeScriptException: 
> Calling js method onWebViewEvent failed
> 
> TypeError: Cannot read property 'evaluateJavascript' of null
> 
> StackTrace: 
> 	Frame: function:'push.../node_modules/nativescript-webview-interface/index.js.WebViewInterface._executeJS
> 
> 
