diff --git a/Admin/AdsensePlacement/Infrastructure/Ui/AdsensePlacementFormBuilder.php b/Admin/AdsensePlacement/Infrastructure/Ui/AdsensePlacementFormBuilder.php
index 0e13d3f1..6edd72cd 100644
--- a/Admin/AdsensePlacement/Infrastructure/Ui/AdsensePlacementFormBuilder.php
+++ b/Admin/AdsensePlacement/Infrastructure/Ui/AdsensePlacementFormBuilder.php
@@ -622,7 +622,7 @@ final class AdsensePlacementFormBuilder
         // Trigger
         $vignetteTrigger = $this->renderer->getFieldValue($cid, 'vignette_ads', 'vignette_trigger', 'pageview');
         $html .= $this->buildSelect($cid . 'VignetteTrigger', 'Cuando mostrar',
-            $vignetteTrigger,
+            (string)$vignetteTrigger,
             [
                 'pageview' => 'Al cargar la pagina',
                 'scroll_50' => 'Al scrollear 50%',
@@ -641,14 +641,14 @@ final class AdsensePlacementFormBuilder
         $html .= '    <div class="col-6">';
         $size = $this->renderer->getFieldValue($cid, 'vignette_ads', 'vignette_size', '300x250');
         $html .= $this->buildSelect($cid . 'VignetteSize', 'Tamano',
-            $size,
+            (string)$size,
             ['300x250' => '300x250', '336x280' => '336x280', 'responsive' => 'Responsive']
         );
         $html .= '    </div>';
         $html .= '    <div class="col-6">';
         $opacity = $this->renderer->getFieldValue($cid, 'vignette_ads', 'vignette_overlay_opacity', '0.7');
         $html .= $this->buildSelect($cid . 'VignetteOverlayOpacity', 'Opacidad fondo',
-            $opacity,
+            (string)$opacity,
             ['0.5' => '50%', '0.6' => '60%', '0.7' => '70%', '0.8' => '80%', '0.9' => '90%']
         );
         $html .= '    </div>';
@@ -677,14 +677,14 @@ final class AdsensePlacementFormBuilder
         $html .= '    <div class="col-6">';
         $reshowTime = $this->renderer->getFieldValue($cid, 'vignette_ads', 'vignette_reshow_time', '5');
         $html .= $this->buildSelect($cid . 'VignetteReshowTime', 'Tiempo (min)',
-            $reshowTime,
+            (string)$reshowTime,
             ['1' => '1 min', '2' => '2 min', '3' => '3 min', '4' => '4 min', '5' => '5 min', '10' => '10 min', '15' => '15 min', '30' => '30 min']
         );
         $html .= '    </div>';
         $html .= '    <div class="col-6">';
         $maxSession = $this->renderer->getFieldValue($cid, 'vignette_ads', 'vignette_max_per_session', '3');
         $html .= $this->buildSelect($cid . 'VignetteMaxPerSession', 'Max/sesion',
-            $maxSession,
+            (string)$maxSession,
             ['1' => '1', '2' => '2', '3' => '3', '5' => '5', 'unlimited' => 'Sin limite']
         );
         $html .= '    </div>';