|  | @@ -280,6 +280,18 @@ func (err ErrAccessTokenNotExist) Error() string {
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				|  |  |  	return fmt.Sprintf("access token does not exist [sha: %s]", err.SHA)
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				|  |  |  }
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				|  |  |  
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				|  |  | +type ErrAccessTokenEmpty struct {
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				|  |  | +}
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				|  |  | +
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				|  |  | +func IsErrAccessTokenEmpty(err error) bool {
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				|  |  | +	_, ok := err.(ErrAccessTokenEmpty)
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				|  |  | +	return ok
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				|  |  | +}
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				|  |  | +
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				|  |  | +func (err ErrAccessTokenEmpty) Error() string {
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				|  |  | +	return fmt.Sprintf("access token is empty")
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				|  |  | +}
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				|  |  | +
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				|  |  |  // ________                            .__                __  .__
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				|  |  |  // \_____  \_______  _________    ____ |__|____________ _/  |_|__| ____   ____
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				|  |  |  //  /   |   \_  __ \/ ___\__  \  /    \|  \___   /\__  \\   __\  |/  _ \ /    \
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