diff --git a/easy-batch-core/src/main/java/org/jeasy/batch/core/job/DefaultJobReportMerger.java b/easy-batch-core/src/main/java/org/jeasy/batch/core/job/DefaultJobReportMerger.java
index 412d869b9..348760bf1 100644
--- a/easy-batch-core/src/main/java/org/jeasy/batch/core/job/DefaultJobReportMerger.java
+++ b/easy-batch-core/src/main/java/org/jeasy/batch/core/job/DefaultJobReportMerger.java
@@ -79,8 +79,12 @@ public JobReport mergerReports(JobReport... jobReports) {
         }
 
         //merge results
-        finalJobReport.getMetrics().setStartTime(Collections.min(startTimes));
-        finalJobReport.getMetrics().setEndTime(Collections.max(endTimes));
+        if (!startTimes.isEmpty()) {
+            finalJobReport.getMetrics().setStartTime(Collections.min(startTimes));
+        }
+        if (!endTimes.isEmpty()) {
+            finalJobReport.getMetrics().setEndTime(Collections.max(endTimes));
+        }
 
         // set name
         finalJobReport.setJobName(concatenate(jobNames));