From 784bac0b38116c1b6354ee96bdcbd094dd29f564 Mon Sep 17 00:00:00 2001
From: Anna Shaleva <shaleva.ann@nspcc.ru>
Date: Fri, 13 Mar 2020 12:32:26 +0300
Subject: [PATCH] rpc: bug with empty stack marshalling in getapplicationlog

Problem: cannot marshall empty raw message from appExecResult.Stack

Solution: add handler for case when appExecResult.Stack is an empty string
---
 pkg/rpc/response/result/application_log.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkg/rpc/response/result/application_log.go b/pkg/rpc/response/result/application_log.go
index 83275b9bd..27e2026c0 100644
--- a/pkg/rpc/response/result/application_log.go
+++ b/pkg/rpc/response/result/application_log.go
@@ -46,12 +46,18 @@ func NewApplicationLog(appExecRes *state.AppExecResult, scriptHash util.Uint160)
 
 	triggerString := appExecRes.Trigger.String()
 
+	var rawStack json.RawMessage
+	if len(appExecRes.Stack) != 0 {
+		rawStack = json.RawMessage(appExecRes.Stack)
+	} else {
+		rawStack = json.RawMessage("[]")
+	}
 	executions := []Execution{{
 		Trigger:     triggerString,
 		ScriptHash:  scriptHash,
 		VMState:     appExecRes.VMState,
 		GasConsumed: appExecRes.GasConsumed,
-		Stack:       json.RawMessage(appExecRes.Stack),
+		Stack:       rawStack,
 		Events:      events,
 	}}