dev #75882 fix errors

library/ZendAfi/View/Helper/RenderTable.php

@@ -125,7 +125,9 @@ class ZendAfi_View_Helper_RenderTable_Header extends ZendAfi_View_Helper_BaseHel
     $label = $column->getLabel();
 
     return $this->_tag('th',
-                       is_callable($label) ? $label($this->view) : $label,
+                       (is_scalar($label)
+                        ? $label
+                        : $label($this->view)),
                        $column->getOptions() ? $column->getOptions() : null);
   }
 }