diff --git a/Bench4Q-Agent/src/main/java/org/bench4q/agent/api/TestController.java b/Bench4Q-Agent/src/main/java/org/bench4q/agent/api/TestController.java
index 02841011..70f65e34 100644
--- a/Bench4Q-Agent/src/main/java/org/bench4q/agent/api/TestController.java
+++ b/Bench4Q-Agent/src/main/java/org/bench4q/agent/api/TestController.java
@@ -1,6 +1,7 @@
 package org.bench4q.agent.api;
 
 import java.util.ArrayList;
+import java.util.Date;
 import java.util.List;
 import java.util.UUID;
 
@@ -87,6 +88,7 @@ public class TestController {
 		try {
 			this.getParamFileCollector().collectParamFiles(files, runId);
 			System.out.println(scenarioModel);
+			logger.info("Real start time is:" + new Date(realStartTime));
 			RunScenarioModel runScenarioModel = MarshalHelper.unmarshal(
 					RunScenarioModel.class, scenarioModel);
 			System.out.println(scheduleContent);
@@ -166,6 +168,9 @@ public class TestController {
 						.getBehaviorBriefResult(scenarioContext
 								.getDataCollector());
 				logger.info(pluginImplementBehavior.getId());
+				if (briefModel == null) {
+					continue;
+				}
 				briefModel.setBehaviorUrl(pluginImplementBehavior
 						.getSpecificParamValue("url"));
 				behaviorBriefModels.add(briefModel);
diff --git a/Bench4Q-Agent/src/main/java/org/bench4q/agent/scenario/engine/Schedule.java b/Bench4Q-Agent/src/main/java/org/bench4q/agent/scenario/engine/Schedule.java
index be54f631..48057d1b 100644
--- a/Bench4Q-Agent/src/main/java/org/bench4q/agent/scenario/engine/Schedule.java
+++ b/Bench4Q-Agent/src/main/java/org/bench4q/agent/scenario/engine/Schedule.java
@@ -91,13 +91,15 @@ public class Schedule extends Observable {
 	 * @return get the segment by binary search
 	 */
 	public Segment getSegment(long timeInMilliSecond) {
-		if (this.getSegments() == null
-				|| this.getSegments().size() < 1
-				|| timeInMilliSecond < this.getSegments().get(0).start
-						.getTimeInMilliSecond()) {
+		if (this.getSegments() == null || this.getSegments().size() < 1) {
 			throw new Bench4QRunTimeException(
 					"can't getSegment when segments' size is LT 1");
 		}
+		if (timeInMilliSecond < this.getSegments().get(0).start
+				.getTimeInMilliSecond()) {
+			throw new Bench4QRunTimeException(
+					"can't getSegment when timeInMilliSecond LT 0-segment's start");
+		}
 		if (timeInMilliSecond >= this.getSegments().get(
 				this.getSegments().size() - 1).end.getTimeInMilliSecond()) {
 			this.reachEnd();