diff --git a/app/Http/Requests/Email/SendEmailRequest.php b/app/Http/Requests/Email/SendEmailRequest.php
index a08ea4ba112f..c9ab8aff95f5 100644
--- a/app/Http/Requests/Email/SendEmailRequest.php
+++ b/app/Http/Requests/Email/SendEmailRequest.php
@@ -63,7 +63,7 @@ class SendEmailRequest extends Request
         $user = auth()->user();
 
         return [
-            'template' => 'bail|required|in:'.implode(',', $this->templates),
+            'template' => 'bail|required|string|in:'.implode(',', $this->templates),
             'entity' => 'bail|required|in:App\Models\Invoice,App\Models\Quote,App\Models\Credit,App\Models\RecurringInvoice,App\Models\PurchaseOrder,App\Models\Payment',
             'entity_id' => ['bail', 'required', Rule::exists($this->entity_plural, 'id')->where('company_id', $user->company()->id)],
             'cc_email.*' => 'bail|sometimes|email',