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AbstractController::DoubleRenderError in CoursesController#show #2642

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@hmoffatt

Describe the bug

I have installed the latest Canvas from git using the Docker development instructions.

I invited a new student my course. They received the email invitation, with "You'll need to register with Canvas before you can participate in the class."

When I click the link to https://canvas.mydomain.com/courses/4?invitation=u2BeNowE9YaAhuwMaV0WuObRkRmWL5dZclTBrTln

then I get the error: AbstractController::DoubleRenderError in CoursesController#show

Render and/or redirect were called multiple times in this action. Please note that you may only call render OR redirect, and at most once per action. Also note that neither redirect nor render terminate execution of the action, so if you want to exit an action after redirecting, you need to do something like "redirect_to(...); return"

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