diff --git a/src/main/java/org/codelibs/fess/es/config/exbhv/ScheduledJobBhv.java b/src/main/java/org/codelibs/fess/es/config/exbhv/ScheduledJobBhv.java
index 5e4f41562..7e2a8639a 100644
--- a/src/main/java/org/codelibs/fess/es/config/exbhv/ScheduledJobBhv.java
+++ b/src/main/java/org/codelibs/fess/es/config/exbhv/ScheduledJobBhv.java
@@ -17,13 +17,21 @@ package org.codelibs.fess.es.config.exbhv;
 
 import java.util.regex.Pattern;
 
+import org.apache.commons.lang3.RandomUtils;
 import org.codelibs.fess.es.config.bsbhv.BsScheduledJobBhv;
+import org.codelibs.fess.es.config.exentity.ScheduledJob;
 import org.codelibs.fess.util.ComponentUtil;
+import org.dbflute.optional.OptionalEntity;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * @author FreeGen
  */
 public class ScheduledJobBhv extends BsScheduledJobBhv {
+
+    private static final Logger logger = LoggerFactory.getLogger(ScheduledJobBhv.class);
+
     private String indexName = null;
 
     @Override
@@ -34,4 +42,26 @@ public class ScheduledJobBhv extends BsScheduledJobBhv {
         }
         return indexName;
     }
+
+    @Override
+    public OptionalEntity<ScheduledJob> selectByPK(final String id) {
+        Exception lastException = null;
+        for (int i = 0; i < 30; i++) {
+            try {
+                return super.selectByPK(id);
+            } catch (Exception e) {
+                if (logger.isDebugEnabled()) {
+                    logger.debug("Failed to select a job by " + id, e);
+                }
+                lastException = e;
+                try {
+                    Thread.sleep(RandomUtils.nextLong(500, 5000));
+                } catch (InterruptedException e1) {
+                    // ignore
+                }
+            }
+        }
+        logger.warn("Failed to select a job by " + id, lastException);
+        return OptionalEntity.empty();
+    }
 }
diff --git a/src/main/java/org/codelibs/fess/helper/JobHelper.java b/src/main/java/org/codelibs/fess/helper/JobHelper.java
index 1662b95b0..7258528a4 100644
--- a/src/main/java/org/codelibs/fess/helper/JobHelper.java
+++ b/src/main/java/org/codelibs/fess/helper/JobHelper.java
@@ -27,7 +27,6 @@ import org.codelibs.fess.es.config.exbhv.JobLogBhv;
 import org.codelibs.fess.es.config.exbhv.ScheduledJobBhv;
 import org.codelibs.fess.es.config.exentity.JobLog;
 import org.codelibs.fess.es.config.exentity.ScheduledJob;
-import org.codelibs.fess.exception.JobNotFoundException;
 import org.codelibs.fess.job.ScheduledJobException;
 import org.codelibs.fess.mylasta.direction.FessConfig;
 import org.codelibs.fess.util.ComponentUtil;
@@ -71,8 +70,10 @@ public class JobHelper {
         final CronParamsSupplier paramsOp =
                 () -> {
                     final Map<String, Object> params = new HashMap<>();
-                    params.put(Constants.SCHEDULED_JOB, ComponentUtil.getComponent(ScheduledJobBhv.class).selectByPK(scheduledJob.getId())
-                            .orElseThrow(() -> new JobNotFoundException(scheduledJob)));
+                    ComponentUtil.getComponent(ScheduledJobBhv.class).selectByPK(scheduledJob.getId())
+                            .ifPresent(e -> params.put(Constants.SCHEDULED_JOB, e)).orElse(() -> {
+                                logger.warn("Job " + scheduledJob.getId() + " is not found.");
+                            });
                     return params;
                 };
         findJobByUniqueOf(LaJobUnique.of(id)).ifPresent(job -> {