diff --git a/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/AbstractBaseStep.java b/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/AbstractBaseStep.java
index 030a883a..02b5c662 100644
--- a/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/AbstractBaseStep.java
+++ b/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/AbstractBaseStep.java
@@ -285,8 +285,8 @@ public void processResponse(StepContext<M, R> stepContext) throws Exception { }
      * @throws Exception when an error during response processing occurred
      */
     public final void processResponse(StepContext<M, R> stepContext, byte[] responseBody, Class<R> responseObjectClass) throws Exception {
-        R responseBodyObject = HttpUtil.fromBytes(responseBody, responseObjectClass);
-        ResponseEntity<R> responseEntity = ResponseEntity.of(Optional.of(responseBodyObject));
+        final R responseBodyObject = HttpUtil.fromBytes(responseBody, responseObjectClass);
+        final ResponseEntity<R> responseEntity = ResponseEntity.ofNullable(responseBodyObject);
         addResponseContext(stepContext, responseEntity);
         processResponse(stepContext);
     }
diff --git a/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/v3/GetStatusStep.java b/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/v3/GetStatusStep.java
index cecfdb51..081503a1 100755
--- a/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/v3/GetStatusStep.java
+++ b/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/v3/GetStatusStep.java
@@ -38,6 +38,7 @@
 import org.springframework.core.ParameterizedTypeReference;
 import org.springframework.stereotype.Component;
 
+import javax.crypto.SecretKey;
 import java.util.Base64;
 import java.util.HashMap;
 import java.util.Map;
@@ -144,7 +145,16 @@ public void processResponse(StepContext<GetStatusStepModel, ObjectResponse<Activ
         final Map<String, Object> customObject = responseObject.getCustomObject();
         byte[] challenge = (byte[]) stepContext.getAttributes().get(ATTRIBUTE_CHALLENGE);
 
-        final ActivationStatusBlobInfo statusBlobRaw = ACTIVATION.getStatusFromEncryptedBlob(cStatusBlob, challenge, cStatusBlobNonce, resultStatusObject.getTransportMasterKeyObject());
+        final SecretKey transportMasterKey = resultStatusObject.getTransportMasterKeyObject();
+        if (transportMasterKey == null) {
+            stepContext.getStepLogger().writeError(
+                    getStep().id() + "-failed",
+                    "Get Status Failed",
+                    "transportMasterKey is null");
+            return;
+        }
+
+        final ActivationStatusBlobInfo statusBlobRaw = ACTIVATION.getStatusFromEncryptedBlob(cStatusBlob, challenge, cStatusBlobNonce, transportMasterKey);
         final ExtendedActivationStatusBlobInfo statusBlob = ExtendedActivationStatusBlobInfo.copy(statusBlobRaw);
 
         final Map<String, Object> objectMap = new HashMap<>();
diff --git a/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/v3/VaultUnlockStep.java b/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/v3/VaultUnlockStep.java
index a02695e8..6709157f 100755
--- a/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/v3/VaultUnlockStep.java
+++ b/powerauth-java-cmd-lib/src/main/java/io/getlime/security/powerauth/lib/cmd/steps/v3/VaultUnlockStep.java
@@ -136,7 +136,15 @@ public void processResponse(StepContext<VaultUnlockStepModel, EciesEncryptedResp
 
         ResultStatusObject resultStatusObject = stepContext.getModel().getResultStatus();
 
-        SecretKey transportMasterKey = resultStatusObject.getTransportMasterKeyObject();
+        final SecretKey transportMasterKey = resultStatusObject.getTransportMasterKeyObject();
+        if (transportMasterKey == null) {
+            stepContext.getStepLogger().writeError(
+                    getStep().id() + "-vault-unlock-failed",
+                    "Vault Unlock Failed",
+                    "transportMasterKey is null");
+            return;
+        }
+
         byte[] encryptedDevicePrivateKeyBytes = resultStatusObject.getEncryptedDevicePrivateKeyBytes();
 
         byte[] encryptedVaultEncryptionKey = Base64.getDecoder().decode(responsePayload.getEncryptedVaultEncryptionKey());