diff --git a/sandbox/time_statics.go b/sandbox/time_statics.go
index ff7807b6c89866bc0e6a38a890fb7533cca0644e..08d868cd63422abbde866d9a4dc8598c4c6a6805 100644
--- a/sandbox/time_statics.go
+++ b/sandbox/time_statics.go
@@ -153,7 +153,9 @@ func (t *TxDuration) addSysCallDuration(duration *SysCallDuration) {
 
 // EnterNextStep enter next duration tx step
 func EnterNextStep(msg *protogo.DockerVMMessage, stepType protogo.StepType, log string) {
-
+	if len(msg.StepDurations) == 0 {
+		return
+	}
 	if stepType != protogo.StepType_RUNTIME_PREPARE_TX_REQUEST {
 		endTxStep(msg)
 	}