This is explained in the FAQ: https://golang.org/doc/faq#nil_error

On Tue, 2017-11-14 at 16:37 -0800, Travis Beauvais wrote:
> https://play.golang.org/p/76gIgzXgcS
> 
> Why is err not nil when a is?
> 
> Our theory is that err is a pointer to a nil pointer so technically
> not 
> nil. We would have assumed that a pointer to a nil pointer would be
> nil 
> though. Why is that that not the case?
> 
> By the way, we don't need help with this. We found a workaround and
> are 
> satisfied with that. Just looking for details on why this is the case
> for 
> our own knowledge as it tripped us up for a while.
> 

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