Warning: chr() expects parameter 1 to be int, string given  in /var/www/clients/client0/web2/web/lib/TCPDF/include/tcpdf_fonts.php on line 1671

#0 [internal function]: mageCoreErrorHandler()
#1 /var/www/clients/client0/web2/web/lib/TCPDF/include/tcpdf_fonts.php(1671): chr()
#2 /var/www/clients/client0/web2/web/lib/TCPDF/include/tcpdf_fonts.php(1803): TCPDF_FONTS::unichr()
#3 /var/www/clients/client0/web2/web/lib/TCPDF/include/tcpdf_fonts.php(2099): TCPDF_FONTS::UTF8ArrSubString()
#4 /var/www/clients/client0/web2/web/app/code/local/Ni/Api/Model/Pdf.php(156): TCPDF_FONTS::utf8Bidi()
#5 /var/www/clients/client0/web2/web/app/code/core/Mage/Core/Model/Config.php(1392): Ni_Api_Model_Pdf->__construct()
#6 /var/www/clients/client0/web2/web/app/Mage.php(509): Mage_Core_Model_Config->getModelInstance()
#7 /var/www/clients/client0/web2/web/app/code/local/Ni/Api/controllers/PdfController.php(6): Mage::getModel()
#8 /var/www/clients/client0/web2/web/app/code/core/Mage/Core/Controller/Varien/Action.php(437): Ni_Api_PdfController->previewAction()
#9 /var/www/clients/client0/web2/web/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(262): Mage_Core_Controller_Varien_Action->dispatch()
#10 /var/www/clients/client0/web2/web/app/code/core/Mage/Core/Controller/Varien/Front.php(192): Mage_Core_Controller_Varien_Router_Standard->match()
#11 /var/www/clients/client0/web2/web/app/code/core/Mage/Core/Model/App.php(381): Mage_Core_Controller_Varien_Front->dispatch()
#12 /var/www/clients/client0/web2/web/app/Mage.php(729): Mage_Core_Model_App->run()
#13 /var/www/clients/client0/web2/web/index.php(79): Mage::run()
#14 {main}