diff --git a/htdocs/core/modules/facture/doc/doc_generic_invoice_odt.modules.php b/htdocs/core/modules/facture/doc/doc_generic_invoice_odt.modules.php
index 3d0e0b5e2aa..cc9bc723635 100644
--- a/htdocs/core/modules/facture/doc/doc_generic_invoice_odt.modules.php
+++ b/htdocs/core/modules/facture/doc/doc_generic_invoice_odt.modules.php
@@ -336,9 +336,10 @@ class doc_generic_invoice_odt extends ModelePDFFactures
 				$object->fetchObjectLinked('', '', '', '');
 				//print_r($object->linkedObjects['propal']); exit;
 
-				$propal_object = $object->linkedObjects['propal'];
-				if (isset($propal_object) && sizeof($propal_object)>0) {
-					$propal_object = array_values($object->linkedObjects['propal'])[0];
+				$array_propal_object = $object->linkedObjects['propal'];
+				if (isset($array_propal_object) && is_array($array_propal_object) && count($array_propal_object) > 0) {
+					$tmparrayofvalue = array_values($array_propal_object);
+					$propal_object = $tmparrayofvalue[0];
 				} else {
 					$propal_object = null;
 				}