diff --git a/src/Core/ApiLevelErrorHandler.php b/src/Core/ApiLevelErrorHandler.php
index b25deae..dd2232b 100644
--- a/src/Core/ApiLevelErrorHandler.php
+++ b/src/Core/ApiLevelErrorHandler.php
@@ -8,14 +8,12 @@
 use Bitrix24\SDK\Core\Exceptions\MethodNotFoundException;
 use Bitrix24\SDK\Core\Exceptions\OperationTimeLimitExceededException;
 use Bitrix24\SDK\Core\Exceptions\QueryLimitExceededException;
+use Bitrix24\SDK\Services\Workflows\Exceptions\ActivityOrRobotAlreadyInstalledException;
+use Bitrix24\SDK\Services\Workflows\Exceptions\ActivityOrRobotValidationFailureException;
 use Psr\Log\LoggerInterface;
 
 /**
  * Handle api-level errors and throw related exception
- *
- * Class ApiLevelErrorHandler
- *
- * @package Bitrix24\SDK\Core
  */
 class ApiLevelErrorHandler
 {
@@ -90,6 +88,10 @@ private function handleError(array $responseBody, ?string $batchCommandId = null
                 throw new MethodNotFoundException(sprintf('api method not found %s %s', $errorDescription, $batchErrorPrefix));
             case 'operation_time_limit':
                 throw new OperationTimeLimitExceededException(sprintf('operation time limit exceeded %s %s', $errorDescription, $batchErrorPrefix));
+            case 'error_activity_already_installed':
+                throw new ActivityOrRobotAlreadyInstalledException(sprintf('%s - %s', $errorCode, $errorDescription));
+            case 'error_activity_validation_failure':
+                throw new ActivityOrRobotValidationFailureException(sprintf('%s - %s', $errorCode, $errorDescription));
             default:
                 throw new BaseException(sprintf('%s - %s %s', $errorCode, $errorDescription, $batchErrorPrefix));
         }
diff --git a/src/Core/Core.php b/src/Core/Core.php
index 7351139..979aa78 100644
--- a/src/Core/Core.php
+++ b/src/Core/Core.php
@@ -108,6 +108,16 @@ public function call(string $apiMethod, array $parameters = []): Response
                     // dispatch event, application listeners update domain url host in accounts repository
                     $this->eventDispatcher->dispatch(new PortalDomainUrlChangedEvent($portalOldDomainUrlHost, $portalNewDomainUrlHost));
                     break;
+                case StatusCodeInterface::STATUS_BAD_REQUEST:
+                    $body = $apiCallResponse->toArray(false);
+                    $this->logger->notice(
+                        'bad request',
+                        [
+                            'body' => $body,
+                        ]
+                    );
+                    $this->apiLevelErrorHandler->handle($body);
+                    break;
                 case StatusCodeInterface::STATUS_UNAUTHORIZED:
                     $body = $apiCallResponse->toArray(false);
                     $this->logger->debug(
diff --git a/src/Services/Workflows/Exceptions/ActivityOrRobotAlreadyInstalledException.php b/src/Services/Workflows/Exceptions/ActivityOrRobotAlreadyInstalledException.php
new file mode 100644
index 0000000..bb3ee0e
--- /dev/null
+++ b/src/Services/Workflows/Exceptions/ActivityOrRobotAlreadyInstalledException.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Bitrix24\SDK\Services\Workflows\Exceptions;
+
+use Bitrix24\SDK\Core\Exceptions\InvalidArgumentException;
+
+class ActivityOrRobotAlreadyInstalledException extends InvalidArgumentException
+{
+}
\ No newline at end of file
diff --git a/src/Services/Workflows/Exceptions/ActivityOrRobotValidationFailureException.php b/src/Services/Workflows/Exceptions/ActivityOrRobotValidationFailureException.php
new file mode 100644
index 0000000..8dd148f
--- /dev/null
+++ b/src/Services/Workflows/Exceptions/ActivityOrRobotValidationFailureException.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Bitrix24\SDK\Services\Workflows\Exceptions;
+
+use Bitrix24\SDK\Core\Exceptions\InvalidArgumentException;
+
+class ActivityOrRobotValidationFailureException extends InvalidArgumentException
+{
+}
\ No newline at end of file