diff --git a/_examples/golang-basics/main.go b/_examples/golang-basics/main.go
index 4d79d34a..17454a1f 100644
--- a/_examples/golang-basics/main.go
+++ b/_examples/golang-basics/main.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"fmt"
 	"log"
 	"net/http"
 
@@ -55,6 +56,9 @@ func (s *ExampleServiceRPC) GetUser(ctx context.Context, header map[string]strin
 	if userID == 911 {
 		return 0, nil, ErrUserNotFound
 	}
+	if userID == 31337 {
+		return 0, nil, ErrorWithCause(ErrUserNotFound, fmt.Errorf("unknown user id %d", userID))
+	}
 
 	return 200, &User{
 		ID:       userID,