diff --git a/htdocs/core/lib/files.lib.php b/htdocs/core/lib/files.lib.php
index ae4afc695e6..77375200bc4 100644
--- a/htdocs/core/lib/files.lib.php
+++ b/htdocs/core/lib/files.lib.php
@@ -1567,7 +1567,9 @@ function dol_meta_create($object)
 		}
 
 		if (is_dir($dir)) {
+			if (is_countable($object->lines) && count($object->lines) > 0) {
 			$nblines = count($object->lines);
+		}
 			$client = $object->thirdparty->name." ".$object->thirdparty->address." ".$object->thirdparty->zip." ".$object->thirdparty->town;
 			$meta = "REFERENCE=\"".$object->ref."\"
 			DATE=\"" . dol_print_date($object->date, '')."\"