diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index cec7408f1ca..5b8cc47a6d1 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -1582,7 +1582,7 @@ abstract class CommonDocGenerator
 				$colDef['title']['label'] = !empty($colDef['title']['label']) ? $colDef['title']['label'] : $outputlangs->transnoentities($colDef['title']['textkey']);
 
 				// Add column separator
-				if (!empty($colDef['border-left'])) {
+				if (!empty($colDef['border-left']) && isset($colDef['xStartPos'])) {
 					$pdf->line($colDef['xStartPos'], $tab_top, $colDef['xStartPos'], $tab_top + $tab_height);
 				}