diff --git a/eth/tracers/logger/logger.go b/eth/tracers/logger/logger.go
index 596ee97146..e714231339 100644
--- a/eth/tracers/logger/logger.go
+++ b/eth/tracers/logger/logger.go
@@ -177,7 +177,7 @@ func (s *StructLog) toLegacyJSON() json.RawMessage {
 	if len(s.ReturnData) > 0 {
 		msg.ReturnData = hexutil.Bytes(s.ReturnData).String()
 	}
-	if s.Memory != nil {
+	if s.Memory != nil && len(s.Memory) > 0 {
 		memory := make([]string, 0, (len(s.Memory)+31)/32)
 		for i := 0; i+32 <= len(s.Memory); i += 32 {
 			memory = append(memory, fmt.Sprintf("%x", s.Memory[i:i+32]))