diff --git a/mcumgr-core/src/main/java/io/runtime/mcumgr/dfu/suit/task/UploadEnvelope.java b/mcumgr-core/src/main/java/io/runtime/mcumgr/dfu/suit/task/UploadEnvelope.java
index b281aff1..096b99fb 100644
--- a/mcumgr-core/src/main/java/io/runtime/mcumgr/dfu/suit/task/UploadEnvelope.java
+++ b/mcumgr-core/src/main/java/io/runtime/mcumgr/dfu/suit/task/UploadEnvelope.java
@@ -18,10 +18,12 @@ class UploadEnvelope extends SUITUpgradeTask {
     private final static Logger LOG = LoggerFactory.getLogger(UploadEnvelope.class);
     private final byte @NotNull [] envelope;
     private final boolean deferInstall;
+    private boolean canceled = false;
 
     /**
      * Upload controller used to pause, resume, and cancel upload. Set when the upload is started.
      */
+    @Nullable
     private TransferController mUploadController;
 
     public UploadEnvelope(final byte @NotNull [] envelope, final boolean deferInstall) {
@@ -72,6 +74,12 @@ public void onUploadCompleted() {
             }
         };
 
+        // Check if the task was canceled before starting the upload.
+        if (canceled) {
+            callback.onUploadCanceled();
+            return;
+        }
+
         LOG.info("Uploading SUIT envelope of size: {}", envelope.length);
         final SUITUpgradePerformer.Settings settings = performer.getSettings();
         final SUITManager manager = new SUITManager(performer.getTransport());
@@ -86,11 +94,17 @@ public void onUploadCompleted() {
 
     @Override
     public void pause() {
-        mUploadController.pause();
+        if (mUploadController != null) {
+            mUploadController.pause();
+        }
     }
 
     @Override
     public void cancel() {
-        mUploadController.cancel();
+        if (mUploadController != null) {
+            mUploadController.cancel();
+        } else {
+            canceled = true;
+        }
     }
 }
diff --git a/mcumgr-core/src/main/java/io/runtime/mcumgr/dfu/suit/task/UploadResource.java b/mcumgr-core/src/main/java/io/runtime/mcumgr/dfu/suit/task/UploadResource.java
index 5f336fbe..8ba7d557 100644
--- a/mcumgr-core/src/main/java/io/runtime/mcumgr/dfu/suit/task/UploadResource.java
+++ b/mcumgr-core/src/main/java/io/runtime/mcumgr/dfu/suit/task/UploadResource.java
@@ -19,10 +19,12 @@ class UploadResource extends SUITUpgradeTask {
 
     private final byte @NotNull [] data;
     private final int sessionId;
+    private boolean canceled = false;
 
     /**
      * Upload controller used to pause, resume, and cancel upload. Set when the upload is started.
      */
+    @Nullable
     private TransferController mUploadController;
 
     public UploadResource(
@@ -79,6 +81,12 @@ public void onUploadCompleted() {
             }
         };
 
+        // Check if the task was canceled before starting the upload.
+        if (canceled) {
+            callback.onUploadCanceled();
+            return;
+        }
+
         LOG.info("Uploading resource with session ID: {} ({} bytes)", sessionId, data.length);
         final SUITUpgradePerformer.Settings settings = performer.getSettings();
         final SUITManager manager = new SUITManager(performer.getTransport());
@@ -93,11 +101,17 @@ public void onUploadCompleted() {
 
     @Override
     public void pause() {
-        mUploadController.pause();
+        if (mUploadController != null) {
+            mUploadController.pause();
+        }
     }
 
     @Override
     public void cancel() {
-        mUploadController.cancel();
+        if (mUploadController != null) {
+            mUploadController.cancel();
+        } else {
+            canceled = true;
+        }
     }
 }