diff --git a/escheduler-api/src/main/java/cn/escheduler/api/enums/Status.java b/escheduler-api/src/main/java/cn/escheduler/api/enums/Status.java
index 4867f3ca98..f0096f9648 100644
--- a/escheduler-api/src/main/java/cn/escheduler/api/enums/Status.java
+++ b/escheduler-api/src/main/java/cn/escheduler/api/enums/Status.java
@@ -212,6 +212,7 @@ public enum Status {
     DELETE_SCHEDULE_CRON_BY_ID_ERROR(50024,"delete schedule by id error"),
     BATCH_DELETE_PROCESS_DEFINE_ERROR(50025,"batch delete process definition error"),
     BATCH_DELETE_PROCESS_DEFINE_BY_IDS_ERROR(50026,"batch delete process definition by ids {0} error"),
+    TENANT_NOT_SUITABLE(50027,"there is not any tenant suitable, please choose a tenant available."),
 
     HDFS_NOT_STARTUP(60001,"hdfs not startup"),
     HDFS_TERANT_RESOURCES_FILE_EXISTS(60002,"resource file exists,please delete resource first"),
diff --git a/escheduler-api/src/main/java/cn/escheduler/api/service/ExecutorService.java b/escheduler-api/src/main/java/cn/escheduler/api/service/ExecutorService.java
index 9602ac6cef..a2a480f43c 100644
--- a/escheduler-api/src/main/java/cn/escheduler/api/service/ExecutorService.java
+++ b/escheduler-api/src/main/java/cn/escheduler/api/service/ExecutorService.java
@@ -110,6 +110,13 @@ public class ExecutorService extends BaseService{
             return result;
         }
 
+        if (!checkTenantSuitable(processDefinition)){
+            logger.error("there is not any vaild tenant for the process definition: id:{},name:{}, ",
+                    processDefinition.getId(), processDefinition.getName());
+            putMsg(result, Status.TENANT_NOT_SUITABLE);
+            return result;
+        }
+
         /**
          * create command
          */
@@ -190,15 +197,10 @@ public class ExecutorService extends BaseService{
         if (status != Status.SUCCESS) {
             return checkResult;
         }
-
-        // checkTenantExists();
-        Tenant tenant = processDao.getTenantForProcess(processDefinition.getTenantId(),
-                processDefinition.getUserId());
-        if(tenant == null){
+        if (!checkTenantSuitable(processDefinition)){
             logger.error("there is not any vaild tenant for the process definition: id:{},name:{}, ",
                     processDefinition.getId(), processDefinition.getName());
-            putMsg(result, Status.PROCESS_INSTANCE_NOT_EXIST, processInstanceId);
-            return result;
+            putMsg(result, Status.TENANT_NOT_SUITABLE);
         }
 
         switch (executeType) {
@@ -240,6 +242,21 @@ public class ExecutorService extends BaseService{
         return result;
     }
 
+    /**
+     * check tenant suitable
+     * @param processDefinition
+     * @return
+     */
+    private boolean checkTenantSuitable(ProcessDefinition processDefinition) {
+        // checkTenantExists();
+        Tenant tenant = processDao.getTenantForProcess(processDefinition.getTenantId(),
+                processDefinition.getUserId());
+        if(tenant == null){
+            return false;
+        }
+        return true;
+    }
+
     /**
      * Check the state of process instance and the type of operation match
      *
diff --git a/escheduler-common/src/main/java/cn/escheduler/common/queue/TaskQueueZkImpl.java b/escheduler-common/src/main/java/cn/escheduler/common/queue/TaskQueueZkImpl.java
index 73f7499fa7..de37b5ffce 100644
--- a/escheduler-common/src/main/java/cn/escheduler/common/queue/TaskQueueZkImpl.java
+++ b/escheduler-common/src/main/java/cn/escheduler/common/queue/TaskQueueZkImpl.java
@@ -228,11 +228,11 @@ public class TaskQueueZkImpl extends AbstractZKClient implements ITaskQueue {
         int j = 0;
         List<String> taskslist = new ArrayList<>(tasksNum);
         while(iterator.hasNext()){
-            if(j++ < tasksNum){
-                String task = iterator.next();
-
-                taskslist.add(getOriginTaskFormat(task));
+            if(j++ >= tasksNum){
+                break;
             }
+            String task = iterator.next();
+            taskslist.add(getOriginTaskFormat(task));
         }
         return taskslist;
     }
@@ -245,6 +245,9 @@ public class TaskQueueZkImpl extends AbstractZKClient implements ITaskQueue {
      */
     private String getOriginTaskFormat(String formatTask){
         String[] taskArray = formatTask.split(Constants.UNDERLINE);
+        if(taskArray.length< 4){
+            return formatTask;
+        }
         int processInstanceId = Integer.parseInt(taskArray[1]);
         int taskId = Integer.parseInt(taskArray[3]);
 
diff --git a/escheduler-server/src/main/java/cn/escheduler/server/worker/runner/FetchTaskThread.java b/escheduler-server/src/main/java/cn/escheduler/server/worker/runner/FetchTaskThread.java
index 2d88fdb843..de4666d102 100644
--- a/escheduler-server/src/main/java/cn/escheduler/server/worker/runner/FetchTaskThread.java
+++ b/escheduler-server/src/main/java/cn/escheduler/server/worker/runner/FetchTaskThread.java
@@ -210,6 +210,11 @@ public class FetchTaskThread implements Runnable{
 
                             Tenant tenant = processDao.getTenantForProcess(processInstance.getTenantId(),
                                     processDefine.getUserId());
+                            if(tenant == null){
+                                logger.error("cannot find suitable tenant for the task:{}, process instance tenant:{}, process definition tenant:{}",
+                                        taskInstance.getName(),processInstance.getTenantId(), processDefine.getTenantId());
+                                continue;
+                            }
 
                             // check and create Linux users
                             FileUtils.createWorkDirAndUserIfAbsent(execLocalPath,