diff --git a/common/data/src/main/java/org/thingsboard/server/common/data/job/JobResult.java b/common/data/src/main/java/org/thingsboard/server/common/data/job/JobResult.java
index bd2c73d0d8..6f6d924deb 100644
--- a/common/data/src/main/java/org/thingsboard/server/common/data/job/JobResult.java
+++ b/common/data/src/main/java/org/thingsboard/server/common/data/job/JobResult.java
@@ -55,11 +55,17 @@ public abstract class JobResult implements Serializable {
 
     public void processTaskResult(TaskResult taskResult) {
         if (taskResult.isSuccess()) {
-            successfulCount++;
+            if (totalCount == null || successfulCount < totalCount) {
+                successfulCount++;
+            }
         } else if (taskResult.isDiscarded()) {
-            discardedCount++;
+            if (totalCount == null || discardedCount < totalCount) {
+                discardedCount++;
+            }
         } else {
-            failedCount++;
+            if (totalCount == null || failedCount < totalCount) {
+                failedCount++;
+            }
             if (results.size() < 100) { // preserving only first 100 errors, not reprocessing if there are more failures
                 results.add(taskResult);
             }
diff --git a/dao/src/main/java/org/thingsboard/server/dao/job/DefaultJobService.java b/dao/src/main/java/org/thingsboard/server/dao/job/DefaultJobService.java
index 360aa0063b..40200d6fed 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/job/DefaultJobService.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/job/DefaultJobService.java
@@ -87,11 +87,7 @@ public class DefaultJobService extends AbstractEntityService implements JobServi
         }
         job.getResult().setCancellationTs(System.currentTimeMillis());
         JobStatus prevStatus = job.getStatus();
-        if (job.getStatus() == QUEUED) {
-            job.setStatus(CANCELLED); // setting cancelled status right away, because we don't expect stats for cancelled tasks
-        } else if (job.getStatus() == PENDING) {
-            job.setStatus(RUNNING);
-        }
+        job.setStatus(CANCELLED);
         saveJob(tenantId, job, true, prevStatus);
     }
 
@@ -145,7 +141,7 @@ public class DefaultJobService extends AbstractEntityService implements JobServi
             }
         }
 
-        if (job.getStatus() == RUNNING) {
+        if (job.getStatus().isOneOf(RUNNING, CANCELLED)) {
             if (result.getTotalCount() != null && result.getCompletedCount() >= result.getTotalCount()) {
                 if (result.getCancellationTs() > 0) {
                     job.setStatus(CANCELLED);
@@ -193,7 +189,7 @@ public class DefaultJobService extends AbstractEntityService implements JobServi
 
     private void checkWaitingJobs(TenantId tenantId, JobType jobType) {
         Job queuedJob = jobDao.findOldestByTenantIdAndTypeAndStatusForUpdate(tenantId, jobType, QUEUED);
-        if (queuedJob == null) {
+        if (queuedJob == null || jobDao.existsByTenantIdAndTypeAndStatusOneOf(tenantId, jobType, PENDING, RUNNING)) {
             return;
         }
         queuedJob.setStatus(PENDING);