diff --git a/dev/cosbench-core/src/com/intel/cosbench/exporter/AbstractLatencyExporter.java b/dev/cosbench-core/src/com/intel/cosbench/exporter/AbstractLatencyExporter.java
index c9f065d9..b7771a47 100644
--- a/dev/cosbench-core/src/com/intel/cosbench/exporter/AbstractLatencyExporter.java
+++ b/dev/cosbench-core/src/com/intel/cosbench/exporter/AbstractLatencyExporter.java
@@ -55,6 +55,8 @@ public void export(Writer writer) throws IOException {
         accs = new int[metricsNum];
         for (Metrics metrics : workload.getReport()) {
             int sum = 0;
+            if(metrics.getLatency() == null)
+            	continue;
             int[] data = metrics.getLatency().getHistoData();
             for (int idx = 0; idx < size; idx++)
                 sum += data[idx];
diff --git a/dev/cosbench-core/src/com/intel/cosbench/exporter/CSVLatencyExporter.java b/dev/cosbench-core/src/com/intel/cosbench/exporter/CSVLatencyExporter.java
index b09075e3..5e8814dc 100644
--- a/dev/cosbench-core/src/com/intel/cosbench/exporter/CSVLatencyExporter.java
+++ b/dev/cosbench-core/src/com/intel/cosbench/exporter/CSVLatencyExporter.java
@@ -79,7 +79,7 @@ protected void writeHistogram(Writer writer, int idx) throws IOException {
         for (StageInfo stage : workload.getStageInfos()) {
         	for (Metrics metrics : stage.getReport()) {
         		metricsIdx++;
-        		if (!metrics.getOpName().equals(metrics.getSampleType())) {
+        		if (!metrics.getOpName().equals(metrics.getSampleType()) || metrics.getLatency() == null) {
         			continue; /*skip for special work*/
         		}
         		int count = metrics.getLatency().getHistoData()[idx];
diff --git a/dev/cosbench-core/src/com/intel/cosbench/exporter/CSVMatrixExporter.java b/dev/cosbench-core/src/com/intel/cosbench/exporter/CSVMatrixExporter.java
index ac5a1a06..b920cb38 100644
--- a/dev/cosbench-core/src/com/intel/cosbench/exporter/CSVMatrixExporter.java
+++ b/dev/cosbench-core/src/com/intel/cosbench/exporter/CSVMatrixExporter.java
@@ -102,12 +102,22 @@ protected void writeMetrics(Writer writer, StageInfo stage,
 
     private static void writeLatencyInfo(StringBuilder buffer, Histogram latency)
             throws IOException {
-        writePercentileRT(buffer, latency.get_60());
-        writePercentileRT(buffer, latency.get_80());
-        writePercentileRT(buffer, latency.get_90());
-        writePercentileRT(buffer, latency.get_95());
-        writePercentileRT(buffer, latency.get_99());
-        writePercentileRT(buffer, latency.get_100());
+    	if(latency == null) {
+    		writePercentileRT(buffer, null);
+    		writePercentileRT(buffer, null);
+    		writePercentileRT(buffer, null);
+    		writePercentileRT(buffer, null);
+    		writePercentileRT(buffer, null);
+    		writePercentileRT(buffer, null);
+    	}else {   
+    		writePercentileRT(buffer, latency.get_60());
+    		writePercentileRT(buffer, latency.get_80());
+    		writePercentileRT(buffer, latency.get_90());
+    		writePercentileRT(buffer, latency.get_95());
+    		writePercentileRT(buffer, latency.get_99());
+    		writePercentileRT(buffer, latency.get_100());
+		}   
+ 
     }
 
     private static void writePercentileRT(StringBuilder buffer, long[] resTime) {