diff --git a/app/Service/Import/Importers/TogglDataImporter.php b/app/Service/Import/Importers/TogglDataImporter.php
index eacb14a0..07a4bb04 100644
--- a/app/Service/Import/Importers/TogglDataImporter.php
+++ b/app/Service/Import/Importers/TogglDataImporter.php
@@ -6,6 +6,7 @@ namespace App\Service\Import\Importers;
 
 use Exception;
 use Spatie\TemporaryDirectory\TemporaryDirectory;
+use ValueError;
 use ZipArchive;
 
 class TogglDataImporter extends DefaultImporter
@@ -20,7 +21,10 @@ class TogglDataImporter extends DefaultImporter
             $zip = new ZipArchive();
             $temporaryDirectory = TemporaryDirectory::make();
             file_put_contents($temporaryDirectory->path('import.zip'), $data);
-            $zip->open($temporaryDirectory->path('import.zip'), ZipArchive::RDONLY);
+            $res = $zip->open($temporaryDirectory->path('import.zip'), ZipArchive::RDONLY);
+            if ($res !== true) {
+                throw new ImportException('Invalid ZIP, error code: '.$res);
+            }
             $temporaryDirectory = TemporaryDirectory::make();
             $zip->extractTo($temporaryDirectory->path());
             $zip->close();
@@ -107,6 +111,8 @@ class TogglDataImporter extends DefaultImporter
                     ], [], (string) $task->id);
                 }
             }
+        } catch (ValueError $exception) {
+
         } catch (ImportException $exception) {
             throw $exception;
         } catch (Exception $exception) {
diff --git a/tests/Unit/Service/Import/Importer/TogglDataImporterTest.php b/tests/Unit/Service/Import/Importer/TogglDataImporterTest.php
index 2066dae4..06ebb5c5 100644
--- a/tests/Unit/Service/Import/Importer/TogglDataImporterTest.php
+++ b/tests/Unit/Service/Import/Importer/TogglDataImporterTest.php
@@ -5,7 +5,9 @@ declare(strict_types=1);
 namespace Tests\Unit\Service\Import\Importer;
 
 use App\Models\Organization;
+use App\Service\Import\Importers\ImportException;
 use App\Service\Import\Importers\TogglDataImporter;
+use Exception;
 use Illuminate\Support\Facades\Storage;
 use Illuminate\Support\Str;
 use Spatie\TemporaryDirectory\TemporaryDirectory;
@@ -27,6 +29,25 @@ class TogglDataImporterTest extends ImporterTestAbstract
         return $zipPath;
     }
 
+    public function test_import_throws_exception_if_data_is_not_zip(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $importer = new TogglDataImporter();
+        $importer->init($organization);
+
+        // Act
+        try {
+            $importer->importData('not a zip');
+        } catch (Exception $e) {
+            $this->assertInstanceOf(ImportException::class, $e);
+            $this->assertSame('Invalid ZIP, error code: 19', $e->getMessage());
+
+            return;
+        }
+        $this->fail();
+    }
+
     public function test_import_of_test_file_succeeds(): void
     {
         // Arrange
@@ -48,7 +69,6 @@ class TogglDataImporterTest extends ImporterTestAbstract
         $this->assertSame(1, $report->usersCreated);
         $this->assertSame(2, $report->projectsCreated);
         $this->assertSame(1, $report->clientsCreated);
-
     }
 
     public function test_import_of_test_file_twice_succeeds(): void