diff --git a/sourcecode/hub/app/Console/Commands/AddLtiToolExtra.php b/sourcecode/hub/app/Console/Commands/AddLtiToolExtra.php
index 545e04fd9..3aa90850e 100644
--- a/sourcecode/hub/app/Console/Commands/AddLtiToolExtra.php
+++ b/sourcecode/hub/app/Console/Commands/AddLtiToolExtra.php
@@ -8,6 +8,7 @@
 use App\Models\LtiToolExtra;
 use Illuminate\Console\Command;
 use Illuminate\Support\Facades\DB;
+use function is_string;
 
 class AddLtiToolExtra extends Command
 {
@@ -27,11 +28,14 @@ public function handle(): void
             ->firstOrFail();
 
         DB::transaction(function () use ($tool) {
+            $slug = $this->option('slug');
             $extra = new LtiToolExtra();
             $extra->name = $this->argument('name');
             $extra->lti_launch_url = $this->argument('url');
             $extra->admin = $this->option('admin');
-            $extra->slug = $this->option('slug');
+            if (is_string($slug)) {
+                $extra->slug = $slug;
+            }
             $extra->lti_tool_id = $tool->id;
             $extra->save();
         });
diff --git a/sourcecode/hub/tests/Feature/Commands/AddLtiToolExtraTest.php b/sourcecode/hub/tests/Feature/Commands/AddLtiToolExtraTest.php
index 9687c6598..f7e04995c 100644
--- a/sourcecode/hub/tests/Feature/Commands/AddLtiToolExtraTest.php
+++ b/sourcecode/hub/tests/Feature/Commands/AddLtiToolExtraTest.php
@@ -28,7 +28,7 @@ public function testAddsLtiTool(): void
         $extra = LtiToolExtra::where('slug', 'ca-admin')->firstOrFail();
         assert($extra instanceof LtiToolExtra);
 
-        $this->assertTrue($extra->tool->is($tool));
+        $this->assertTrue($extra->tool?->is($tool));
         $this->assertSame('CA admin', $extra->name);
         $this->assertSame('https://ca.edlib.test/lti/admin', $extra->lti_launch_url);
         $this->assertSame('ca-admin', $extra->slug);