Removing a view causing my app to crash?

Hi all, Im working on a screen which has a couple of input text fields and labels and a continue button. On the continue button click I am removing my variable 'container' and adding a different container with different text fields etc. It is all very basic but on my continue button click event, I am getting random crashes, maybe 60-70% of the time it crashes. The error it reports is just that message, 'unfortunately <<appname>> has closed'. Any ideas what it could potentially be? Continue button event listener below and I am getting as far as the crash 3 when I run in debug mode. The log seems to indicate I have a permission denial, but literally all I am doing is replacing a view with a different view. I'm stumped:

Continue_btn.addEventListener('click', function (e){
        console.log('-------- crash 1');
        Continue_btn.setBackgroundImage('/images/continue2.png');
        console.log('-------- crash 2');
        self.remove(Container);
        console.log('-------- crash 3');
        self.add(Container2);
        console.log('-------- crash 4');
        Navbar.add(BackArrow_btn);
        console.log('-------- crash 5');
 
    });

[INFO][TiAPI   (24651)]  -------- crash 1
[INFO][TiAPI   (24651)]  -------- crash 2
[WARN][ActivityManager( 2347)] Permission Denial: get/set setting for user asks to run as user -2 but is calling from user 0; this requires android.permission.INTERACT_ACROSS_USERS_FULL
[INFO][TiAPI   (24651)]  -------- crash 3