Use mb_substr.

Author: yajra

src/Html/Column.php

@@ -403,7 +403,7 @@ public function renderJs($value, ...$params)
             foreach ($params as $param) {
                 $value .= "'{$param}',";
             }
-            $value = substr($value, 0, strlen($value) - 1);
+            $value = mb_substr($value, 0, - 1);
             $value .= ')';
         }