fix #939 (#969)

* fix #939

fix #939

* fixcheckstyle

apm-collector/apm-collector-storage/collector-storage-es-provider/src/main/java/org/apache/skywalking/apm/collector/storage/es/dao/ui/InstanceMetricEsUIDAO.java

@@ -144,7 +144,12 @@ public class InstanceMetricEsUIDAO extends EsDAO implements IInstanceMetricUIDAO
                 long errorCallTimes = ((Number)response.getResponse().getSource().get(InstanceMetricTable.COLUMN_TRANSACTION_ERROR_CALLS)).longValue();
                 long durationSum = ((Number)response.getResponse().getSource().get(InstanceMetricTable.COLUMN_TRANSACTION_DURATION_SUM)).longValue();
                 long errorDurationSum = ((Number)response.getResponse().getSource().get(InstanceMetricTable.COLUMN_BUSINESS_TRANSACTION_ERROR_DURATION_SUM)).longValue();
-                responseTimeTrends.add((int)((durationSum - errorDurationSum) / (callTimes - errorCallTimes)));
+                long correctCallTimes = callTimes - errorCallTimes;
+                if (correctCallTimes != 0L) {
+                    responseTimeTrends.add((int)((durationSum - errorDurationSum) / correctCallTimes));
+                } else {
+                    responseTimeTrends.add(0);
+                }
             } else {
                 responseTimeTrends.add(0);
             }