TypeError: Cannot read property 'undefined' of undefined IONIC 3

Guys I’m having this error in my code

Error: Uncaught (in promise): TypeError: Cannot read property 'undefined' of undefined
TypeError: Cannot read property 'undefined' of undefined
    at ConteudoPage.webpackJsonp.271.ConteudoPage.ngAfterContentInit (http://localhost:8100/build/main.js:4315:40)
    at callProviderLifecycles (http://localhost:8100/build/vendor.js:12776:18)
    at callElementProvidersLifecycles (http://localhost:8100/build/vendor.js:12753:13)
    at callLifecycleHooksChildrenFirst (http://localhost:8100/build/vendor.js:12737:17)
    at checkAndUpdateView (http://localhost:8100/build/vendor.js:13865:5)
    at callViewAction (http://localhost:8100/build/vendor.js:14212:21)
    at execComponentViewsAction (http://localhost:8100/build/vendor.js:14144:13)
    at Object.checkAndUpdateView (http://localhost:8100/build/vendor.js:13868:5)
    at ViewRef_.detectChanges (http://localhost:8100/build/vendor.js:11654:18)
    at NavControllerBase._viewAttachToDOM (http://localhost:8100/build/vendor.js:54175:40)
    at c (http://localhost:8100/build/polyfills.js:3:19752)
    at Object.reject (http://localhost:8100/build/polyfills.js:3:19174)
    at NavControllerBase._fireError (http://localhost:8100/build/vendor.js:53938:16)
    at NavControllerBase._failed (http://localhost:8100/build/vendor.js:53931:14)
    at http://localhost:8100/build/vendor.js:53978:59
    at t.invoke (http://localhost:8100/build/polyfills.js:3:14976)
    at Object.onInvoke (http://localhost:8100/build/vendor.js:4983:33)
    at t.invoke (http://localhost:8100/build/polyfills.js:3:14916)
    at r.run (http://localhost:8100/build/polyfills.js:3:10143)
    at http://localhost:8100/build/polyfills.js:3:20242

I am finding the error in this line of code, the error is being found in this IF, could someone help me?

ngAfterContentInit(){ console.log('Carregando After') this.loading.present();

this.events.subscribe('aulaConteudo:loadingVideo', () =>{
  this.exibirConteudo = false;
  let monitor:HTMLDivElement = this.content._elementRef.nativeElement.querySelector('.monitor');
  monitor.style.visibility = 'hidden';
});

 console.log(this.navParams)
 this.aula = this.navParams.data.aula;
 this.aulaOrdem = this.navParams.data.aulaOrdem;
 this.moduloOrdem = this.navParams.data.moduloOrdem;
 this.cursoId = this.navParams.get('cursoId');
 this.usuario = this.navParams.get('usuario');
 this.tituloCurso =  "teste"; //this.aula.tituloCurso;
 this.paginasTotal = 8;

 if (this.aulaOrdem == 1 && this.moduloOrdem == 1) {
   this.prev = true;
 }

 if (this.aulaOrdem == this.aula[this.moduloOrdem].aulas.length - 1 && this.moduloOrdem == this.aula.length - 1) {
   this.next = false;
 } `

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