.net - clicking a button without id -

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hello people ive tried multiple ways of trying click button without , id code below

for each element htmlelement in webbrowser1.document.getelementsbytagname("button")   if element.innertext.contains(" yt-uix-button yt-uix-button-primary yt-uix-button-   size-default")     element.invokemember("click")     exit   end if  next element 
error: object reference not set instance of object.


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