diff --git a/htdocs/core/lib/files.lib.php b/htdocs/core/lib/files.lib.php
index c703c65fa2f..e7bf4f302d2 100644
--- a/htdocs/core/lib/files.lib.php
+++ b/htdocs/core/lib/files.lib.php
@@ -1658,7 +1658,7 @@ function dol_add_file_process($upload_dir, $allowoverwrite = 0, $donotupdatesess
 	if (!empty($_FILES[$varfiles])) { // For view $_FILES[$varfiles]['error']
 		dol_syslog('dol_add_file_process upload_dir='.$upload_dir.' allowoverwrite='.$allowoverwrite.' donotupdatesession='.$donotupdatesession.' savingdocmask='.$savingdocmask, LOG_DEBUG);
 		$maxfilesinform = getDolGlobalInt("MAIN_SECURITY_MAX_ATTACHMENT_ON_FORMS", 10);
-		if (count($_FILES[$varfiles]["name"]) > $maxfilesinform) {
+		if (is_array($_FILES[$varfiles]["name"]) && count($_FILES[$varfiles]["name"]) > $maxfilesinform) {
 			$langs->load("errors"); // key must be loaded because we can't rely on loading during output, we need var substitution to be done now.
 			setEventMessages($langs->trans("ErrorTooMuchFileInForm", $maxfilesinform), null, "errors");
 			return -1;