Call to undefined function vmdebug() in vmlanguage.php

[sandomatyas]

When I open a product page with SEF url, I got this:
Error Object
(
    [message:protected] => Call to undefined function vmdebug()
    [string:Error:private] =>
    [code:protected] => 0
    [file:protected] => /administrator/components/com_virtuemart/helpers/vmlanguage.php
    [line:protected] => 113
    [trace:Error:private] => Array
        (
           

• => Array
                  (
                      [file] => /components/com_virtuemart/router.php
                      [line] => 962
                      [function] => setLanguageByTag
                      [class] => vmLanguage
                      [type] => ::
                      [args] => Array
                          (
                             
• => sk-SK
                              [1] =>
                              [2] =>
                          )
  
                  )
  
              [1] => Array
                  (
                      [file] => /components/com_virtuemart/router.php
                      [line] => 374
                      [function] => getInstance
                      [class] => vmrouterHelper
                      [type] => ::
                      [args] => Array
                          (
                          )
  
                  )
  
  The site uses one language. Any guess with this?
  

[sandomatyas]

I digged a bit and found components/com_virtuemart/router.php
public static function getInstance(&$query = null)


There is this if :

Code Select Expand

if (!class_exists( 'VmConfig' ) or !class_exists('VmLanguage') or !isset(VmLanguage::$currLangTag)) {
if (!class_exists( 'VmConfig' )){
require(JPATH_ROOT .'/administrator/components/com_virtuemart/helpers/config.php');
}

VmConfig::loadConfig(FALSE,FALSE,true,false);    // this is needed in case VmConfig was not yet loaded before
//vmdebug('Router Instance, loaded current Lang Tag in config ',VmLanguage::$currLangTag, VmConfig::$vmlang);
}
But somehow this code part never runs in this site when I try to open a productdetails page or search result.
If I add a simple 'true or' or remove the conditions the site is working well.
It happens only on this site maybe some different config? I don't know