Store view using text renderer truncate at char 8, without breaking words is uncaught error

[seansan]

Fatal error: Uncaught Error: Call to undefined method BL_CustomGrid_Helper_String::substr() in /app/code/community/BL/CustomGrid/Helper/String.php:78 Stack trace: #0 /app/code/community/BL/CustomGrid/Block/Widget/Grid/Column/Renderer/Text.php(77): BL_CustomGrid_Helper_String->truncateText('Domain.com\n...', 8, '', '', false) #1 /app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column.php(128): BL_CustomGrid_Block_Widget_Grid_Column_Renderer_Text->render(Object(Fenomics_OrderEmail_Model_Sales_Order)) #2 /app/design/adminhtml/default/default/template/bl/customgrid/widget/grid/16.phtml(201): Mage_Adminhtml_Block_Widget_Grid_Column->getRowField(Object(Fenomics_OrderEmail_Model_Sales_Order)) #3 /app/code/core/Mage/Core/Block/Template.php(241): include('/var/www/html/s...') #4 /app/code/core/Mage/Core/Block/Template.php(273): Mage_Core_B in /app/code/community/BL/CustomGrid/Helper/String.php on line 78