diff --git a/resources/views/portal/ninja2020/invoices/includes/signature.blade.php b/resources/views/portal/ninja2020/invoices/includes/signature.blade.php
index e5e09aae48ce..d2dabf7e4d43 100644
--- a/resources/views/portal/ninja2020/invoices/includes/signature.blade.php
+++ b/resources/views/portal/ninja2020/invoices/includes/signature.blade.php
@@ -28,7 +28,7 @@
                 </button>
             </div>
             <div class="mt-3 flex w-full rounded-md shadow-sm sm:mt-0 sm:w-auto">
-                <button @click="document.getElementById('displaySignatureModal').style.display = 'none';" type="button" class="button button-secondary">
+                <button onclick="document.getElementById('displaySignatureModal').style.display = 'none'; setTimeout(() => this.disabled = true, 0); setTimeout(() => this.disabled = false, 5000); return true;" type="button" class="button button-secondary">
                     {{ ctrans('texts.close') }}
                 </button>
             </div>
diff --git a/resources/views/portal/ninja2020/invoices/includes/terms.blade.php b/resources/views/portal/ninja2020/invoices/includes/terms.blade.php
index 88d7ecf15569..fadd7708831b 100644
--- a/resources/views/portal/ninja2020/invoices/includes/terms.blade.php
+++ b/resources/views/portal/ninja2020/invoices/includes/terms.blade.php
@@ -25,7 +25,11 @@
         </div>
         <div class="mt-5 sm:mt-4 sm:flex sm:flex-row-reverse">
             <div class="flex w-full rounded-md shadow-sm sm:ml-3 sm:w-auto">
-                <button type="button" id="accept-terms-button" class="button button-primary bg-primary">
+                <button 
+                    type="button"
+                    id="accept-terms-button" 
+                    onclick="setTimeout(() => this.disabled = true, 0); setTimeout(() => this.disabled = false, 5000); return true;"
+                    class="button button-primary bg-primary">
                     {{ ctrans('texts.i_agree') }}
                 </button>
             </div>