ngx-extended-pdf-viewer: Use of ngx-extended-pdf-viewer and this.checkHeight() is missing

Check this first

• Does the bug also happen on https://mozilla.github.io/pdf.js/web/viewer.htm? no
• Does the bug also happen on https://pdfviewer.net/simple? no

Describe the bug

I want tu use pdf viewer but there is an error on call from a simple html page. But the window.checkHeight() is not possible because my window has no checkHeight() function

core.js:4002 ERROR TypeError: Cannot read property 'clientHeight' of undefined
    at NgxExtendedPdfViewerComponent.push../node_modules/ngx-extended-pdf-viewer/fesm5/ngx-extended-pdf-viewer.js.NgxExtendedPdfViewerComponent.checkHeight (ngx-extended-pdf-viewer.js:1392)
    at NgxExtendedPdfViewerComponent.push../node_modules/ngx-extended-pdf-viewer/fesm5/ngx-extended-pdf-viewer.js.NgxExtendedPdfViewerComponent.openPDF (ngx-extended-pdf-viewer.js:1815)
    at ngx-extended-pdf-viewer.js:1298
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:423)
    at Object.onInvokeTask (core.js:26247)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:422)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.runTask (zone.js:195)
    at push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask (zone.js:498)
    at ZoneTask.invoke (zone.js:487)
    at timer (zone.js:3070)

Version info

• Version of ngx-extended-pdf-viewer : 1.6.2 and 3.3.1
• Version of the JavaScript files pdf.js, pdf-worker.js and viewer.js : I don’t know… default files used

Desktop (please complete the following information):

• OS: Windows10
• Browser: Chrome
• Version: Chrome 81.0.4044.138 (Build officiel) (64 bits)

To Reproduce

Source file html (the angular part is verified and all data inputs given by javascript functions or variables are correct) : joined html file.

I think I’m not defining a correct html to use pdf viewer but I don’t know where is the problem and how to correct.

Demo PDF file None

Screenshots None

Additional context None