contrib/99designs/gqlgen/tracer.go: only check response nil when fini…

…shing span and update finishing order

contrib/99designs/gqlgen/tracer.go

@@ -117,14 +117,6 @@ func (t *gqlTracer) InterceptOperation(ctx context.Context, next graphql.Operati
 	responseHandler := next(ctx)
 	return func(ctx context.Context) (response *graphql.Response) {
 		defer func() {
-			if span != nil {
-				var err error
-				if response != nil && len(response.Errors) > 0 {
-					err = response.Errors
-				}
-				defer span.Finish(tracer.WithError(err))
-			}
-
 			var (
 				executionOperationRes types.ExecutionOperationRes
 				requestOperationRes   types.RequestOperationRes
@@ -139,6 +131,14 @@ func (t *gqlTracer) InterceptOperation(ctx context.Context, next graphql.Operati
 
 			query.Finish(executionOperationRes)
 			req.Finish(requestOperationRes)
+
+			if span != nil {
+				var err error
+				if response != nil {
+					err = response.Errors
+				}
+				span.Finish(tracer.WithError(err))
+			}
 		}()
 
 		response = responseHandler(ctx)