diff --git a/Resources/views/Collector/form.html.twig b/Resources/views/Collector/form.html.twig
index a10c2231..37f00aca 100644
--- a/Resources/views/Collector/form.html.twig
+++ b/Resources/views/Collector/form.html.twig
@@ -458,7 +458,7 @@
                 </div>
             </div>
 
-            <div class="tab {{ data.submitted_data ?? [] is empty ? 'disabled' }}">
+            <div class="tab {{ (data.submitted_data ?? []) is empty ? 'disabled' }}">
                 <h3 class="tab-title">Submitted Data</h3>
 
                 <div class="tab-content">
@@ -466,7 +466,7 @@
                 </div>
             </div>
 
-            <div class="tab {{ data.passed_options ?? [] is empty ? 'disabled' }}">
+            <div class="tab {{ (data.passed_options ?? []) is empty ? 'disabled' }}">
                 <h3 class="tab-title">Passed Options</h3>
 
                 <div class="tab-content">
@@ -474,7 +474,7 @@
                 </div>
             </div>
 
-            <div class="tab {{ data.resolved_options ?? [] is empty ? 'disabled' }}">
+            <div class="tab {{ (data.resolved_options ?? []) is empty ? 'disabled' }}">
                 <h3 class="tab-title">Resolved Options</h3>
 
                 <div class="tab-content">
@@ -482,7 +482,7 @@
                 </div>
             </div>
 
-            <div class="tab {{ data.view_vars ?? [] is empty ? 'disabled' }}">
+            <div class="tab {{ (data.view_vars ?? []) is empty ? 'disabled' }}">
                 <h3 class="tab-title">View Vars</h3>
 
                 <div class="tab-content">