ERROR TypeError: Cannot read property 'appendChild' of null

Developers Modeler
2

your problem is using angular structural directive (*ngIF) in the following HTML code

<div *ngIf="!isMonitor" fxFlex="100" [ngClass]="opened?'stage-show':'stage-hide'">
              <div id="canvas"></div>
            </div>

“canvas” div is buried under a structural directive is the root cause of this problem. you can use ngClass technique to display and not to display “canvas” div instead of *ngIf

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