From 340c7732016d5c429ede22751d90d98d0609601b Mon Sep 17 00:00:00 2001
From: Sina Mahmoodi <itz.s1na@gmail.com>
Date: Tue, 12 Oct 2021 12:43:34 +0200
Subject: [PATCH] eth/tracers: fix call tracer json result

---
 eth/tracers/native/call.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/eth/tracers/native/call.go b/eth/tracers/native/call.go
index 923fd052c1..22f0f2ccaf 100644
--- a/eth/tracers/native/call.go
+++ b/eth/tracers/native/call.go
@@ -2,6 +2,7 @@ package native
 
 import (
 	"encoding/json"
+	"errors"
 	"math/big"
 	"strconv"
 	"strings"
@@ -101,7 +102,10 @@ func (t *CallTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
 }
 
 func (t *CallTracer) GetResult() (json.RawMessage, error) {
-	res, err := json.Marshal(t.callstack)
+	if len(t.callstack) != 1 {
+		return nil, errors.New("incorrect number of top-level calls")
+	}
+	res, err := json.Marshal(t.callstack[0])
 	if err != nil {
 		return nil, err
 	}