Merge pull request #5481 from Laravel-Backpack/fix-access-to-variable

initialize the variable as an empty array

src/app/Library/Database/Table.php

@@ -5,7 +5,7 @@
 final class Table
 {
     private string $name;
-    private array $columns;
+    private array $columns = [];
 
     public function __construct(string $name, array $columns = [])
     {