diff --git a/src/JasonTable.php b/src/JasonTable.php
index 276891b..bef4652 100644
--- a/src/JasonTable.php
+++ b/src/JasonTable.php
@@ -20,7 +20,7 @@ class JasonTable
         $this->beforePrintCell = $closure;
     }
 
-    public function getCustomCell(string $key, string $cell)
+    public function getCustomCell(string $key, string|null $cell)
     {
         if (is_array($this->beforePrintCell)) {
             foreach ($this->beforePrintCell as $currentKey => $closure) {
diff --git a/src/ListJsonTable.php b/src/ListJsonTable.php
index 26c7742..9f374b2 100644
--- a/src/ListJsonTable.php
+++ b/src/ListJsonTable.php
@@ -29,7 +29,7 @@ class ListJsonTable extends JasonTable
 
     #[NoReturn] public function __construct(string $json)
     {
-        $this->beforePrintCell = false;
+        $this->beforePrintCell = [];
         $this->json = $json;
         $this->data = json_decode($this->json, true);
         $this->baseUrl = $this->data['meta']['baseUrl'] ?? '';
@@ -86,7 +86,7 @@ class ListJsonTable extends JasonTable
                 }
                 foreach ($row as $key => $cell) {
                     if ($this->issetColumn($key) and $this->is_fillable($key)) {
-                        if($this->beforePrintCell and $cell !== null) {
+                        if($this->beforePrintCell) {
                             $cell = $this->getCustomCell($key, $cell);
                         }
                         $this->html .= "<td>" . $cell . "</td>";
diff --git a/src/ViewJsonTable.php b/src/ViewJsonTable.php
index 181d699..ab051c0 100644
--- a/src/ViewJsonTable.php
+++ b/src/ViewJsonTable.php
@@ -39,7 +39,7 @@ class ViewJsonTable extends JasonTable
     {
         foreach ($this->data['meta']['rows'] as $key => $row){
             if ($this->issetRow($key)){
-                if ($this->beforePrintCell and $this->dataJson[$key] !== null) {
+                if ($this->beforePrintCell) {
                     $this->dataJson[$key] = $this->getCustomCell($key, $this->dataJson[$key]);
                 }
                 $this->html .= "<tr><th>" . $row . "</th><td>" . $this->dataJson[$key] . "</td></tr>";