diff --git a/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseAgentStatDao.java b/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseAgentStatDao.java
index 2d6fed295..4150aaaed 100644
--- a/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseAgentStatDao.java
+++ b/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseAgentStatDao.java
@@ -53,21 +53,20 @@ public class HbaseAgentStatDao implements AgentStatDao {
         if (agentId == null) {
             throw new NullPointerException("agentId must not be null");
         }
+        if (range == null) {
+            throw new NullPointerException("range must not be null");
+        }
 
         if (logger.isDebugEnabled()) {
 			logger.debug("scanAgentStat : agentId={}, {}", agentId, range);
 		}
 		
-		if (range.getTo() < range.getFrom()) {
-			logger.error("invalid parameter : agentId={}, {}", agentId, range);
-			return Collections.emptyList();
-		}
-		
+
 		Scan scan = createScan(agentId, range);
 		
 		List<List<TAgentStat>> intermediate = hbaseOperations2.find(HBaseTables.AGENT_STAT, scan, rowKeyDistributor, agentStatMapper);
 		
-		int expectedSize = (int)((range.getTo() - range.getFrom()) / 5000); // 5초간 데이터
+		int expectedSize = (int)(range.getRange() / 5000); // 5초간 데이터
         List<TAgentStat> merged = new ArrayList<TAgentStat>(expectedSize);
         
         for(List<TAgentStat> each : intermediate) {
diff --git a/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseApplicationMapStatisticsCallerDao.java b/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseApplicationMapStatisticsCallerDao.java
index ce87906cb..cf2d10e62 100644
--- a/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseApplicationMapStatisticsCallerDao.java
+++ b/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseApplicationMapStatisticsCallerDao.java
@@ -48,7 +48,13 @@ public class HbaseApplicationMapStatisticsCallerDao implements ApplicationMapSta
 
 	@Override
 	public List<TransactionFlowStatistics> selectCaller(Application calleeApplication, Range range) {
-		Scan scan = createScan(calleeApplication, range);
+        if (calleeApplication == null) {
+            throw new NullPointerException("calleeApplication must not be null");
+        }
+        if (range == null) {
+            throw new NullPointerException("range must not be null");
+        }
+        Scan scan = createScan(calleeApplication, range);
 		final List<List<TransactionFlowStatistics>> foundListList = hbaseOperations2.find(HBaseTables.APPLICATION_MAP_STATISTICS_CALLER, scan, applicationMapStatisticsCallerMapper);
 
 		if (foundListList.isEmpty()) {
diff --git a/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseApplicationTraceIndexDao.java b/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseApplicationTraceIndexDao.java
index 89f98d509..733b407a8 100644
--- a/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseApplicationTraceIndexDao.java
+++ b/src/main/java/com/nhn/pinpoint/web/dao/hbase/HbaseApplicationTraceIndexDao.java
@@ -63,6 +63,9 @@ public class HbaseApplicationTraceIndexDao implements ApplicationTraceIndexDao {
         if (applicationName == null) {
             throw new NullPointerException("applicationName must not be null");
         }
+        if (range == null) {
+            throw new NullPointerException("range must not be null");
+        }
         if (limit < 0) {
             throw new IllegalArgumentException("negative limit:" + limit);
         }
@@ -149,6 +152,9 @@ public class HbaseApplicationTraceIndexDao implements ApplicationTraceIndexDao {
         if (applicationName == null) {
             throw new NullPointerException("applicationName must not be null");
         }
+        if (range == null) {
+            throw new NullPointerException("range must not be null");
+        }
         if (limit < 0) {
             throw new IllegalArgumentException("negative limit:" + limit);
         }
diff --git a/src/main/java/com/nhn/pinpoint/web/vo/Range.java b/src/main/java/com/nhn/pinpoint/web/vo/Range.java
index 1fcc56848..eee07e8d5 100644
--- a/src/main/java/com/nhn/pinpoint/web/vo/Range.java
+++ b/src/main/java/com/nhn/pinpoint/web/vo/Range.java
@@ -10,6 +10,7 @@ public final class Range {
     public Range(long from, long to) {
         this.from = from;
         this.to = to;
+        isValidate();
     }
 
     public long getFrom() {
@@ -20,6 +21,15 @@ public final class Range {
         return to;
     }
 
+    public long getRange() {
+        return to - from;
+    }
+
+    private void isValidate() {
+        if (this.to < this.from) {
+            throw new IllegalArgumentException("invalid range:" + this);
+        }
+    }
 
     @Override
     public boolean equals(Object o) {
diff --git a/src/test/java/com/nhn/pinpoint/web/vo/RangeTest.java b/src/test/java/com/nhn/pinpoint/web/vo/RangeTest.java
new file mode 100644
index 000000000..9d9dcaabd
--- /dev/null
+++ b/src/test/java/com/nhn/pinpoint/web/vo/RangeTest.java
@@ -0,0 +1,31 @@
+package com.nhn.pinpoint.web.vo;
+
+import junit.framework.Assert;
+import org.junit.Test;
+
+/**
+ * @author emeroad
+ */
+public class RangeTest {
+    @Test
+    public void testCreate() {
+        Range range1 = new Range(0, 0);
+        Range range2 = new Range(0, 1);
+
+        try {
+            Range range3 = new Range(0, -1);
+            Assert.fail();
+        } catch (Exception e) {
+        }
+
+    }
+
+    @Test
+    public void testRange() {
+        Range range1 =  new Range(0, 0);
+        Assert.assertEquals(range1.getRange(), 0);
+
+        Range range2 =  new Range(0, 1);
+        Assert.assertEquals(range2.getRange(), 1);
+    }
+}