diff --git a/src/core/BuilderBlock/BuilderBlockContainer.php b/src/core/BuilderBlock/BuilderBlockContainer.php
index 0a2e4ff..78b303b 100644
--- a/src/core/BuilderBlock/BuilderBlockContainer.php
+++ b/src/core/BuilderBlock/BuilderBlockContainer.php
@@ -20,6 +20,11 @@ class BuilderBlockContainer
         return $this->widgets;
     }
 
+    public function hasWidget(string $name)
+    {
+        return isset($this->widgets[$name]);
+    }
+
     public function getWidget(string $name): BuilderBlock
     {
         return $this->widgets[$name];
diff --git a/src/core/Twig/Extension/BuilderExtension.php b/src/core/Twig/Extension/BuilderExtension.php
index 1730a11..b4671b3 100644
--- a/src/core/Twig/Extension/BuilderExtension.php
+++ b/src/core/Twig/Extension/BuilderExtension.php
@@ -30,6 +30,10 @@ class BuilderExtension extends AbstractExtension
         }
 
         if (isset($data['widget'])) {
+            if (!$this->container->hasWidget($data['widget'])) {
+                return '';
+            }
+
             $widget = $this->container->getWidget($data['widget']);
             $widget->buildVars($data);