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                                            helmetica

I always receive the exception: Cannot read properties of null (reading 'getElementsByTagName')

error here: ![image](https://user-images.githubusercontent.com/26686880/185678134-98bacd72-6d5e-4279-aa0b-bf50e32f5360.png) first there is a call to the method of container, and then a check for null `container.getElementsByTagName('canvas')[0]` replace with `document.getElementsByTagName('canvas')[0]`