diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index 33f0b369c14..33d5e5a97c6 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -553,6 +553,12 @@ abstract class CommonDocGenerator
 			$resarray[$array_key.'_project_description'] = $object->project->description;
 			$resarray[$array_key.'_project_date_start'] = dol_print_date($object->project->date_start, 'day');
 			$resarray[$array_key.'_project_date_end'] = dol_print_date($object->project->date_end, 'day');
+		} else { // empty replacement
+			$resarray[$array_key.'_project_ref'] ='';
+			$resarray[$array_key.'_project_title'] = '';
+			$resarray[$array_key.'_project_description'] = '';
+			$resarray[$array_key.'_project_date_start'] = '';
+			$resarray[$array_key.'_project_date_end'] = '';
 		}
 
 		// Add vat by rates
@@ -716,6 +722,14 @@ abstract class CommonDocGenerator
 			foreach ($tmpproduct->array_options as $key => $label) {
 				$resarray["line_product_".$key] = $label;
 			}
+		} else {
+			// Set unused placeholders as blank
+			$extrafields->fetch_name_optionals_label("product");
+			$extralabels = $extrafields->attributes["product"]['label'];
+
+			foreach ($extralabels as $key => $label) {
+				$resarray['line_product_options_'.$key] = '';
+			}
 		}
 
 		return $resarray;
diff --git a/htdocs/expensereport/class/expensereport.class.php b/htdocs/expensereport/class/expensereport.class.php
index 38c39d96b6f..69f02ebb35e 100644
--- a/htdocs/expensereport/class/expensereport.class.php
+++ b/htdocs/expensereport/class/expensereport.class.php
@@ -2728,6 +2728,11 @@ class ExpenseReportLine extends CommonObjectLine
 	 */
 	public $db;
 
+	/**
+	 * @var string Name of table without prefix where object is stored
+	 */
+	public $table_element = 'expensereport_det';
+
 	/**
 	 * @var string Error code (or message)
 	 */