diff --git a/htdocs/api/index.php b/htdocs/api/index.php
index afb0289aa32..a87edf8166c 100644
--- a/htdocs/api/index.php
+++ b/htdocs/api/index.php
@@ -120,7 +120,7 @@ if (empty($conf->global->MAIN_MODULE_API)) {
 // Test if explorer is not disabled
 if (preg_match('/api\/index\.php\/explorer/', $url) && !empty($conf->global->API_EXPLORER_DISABLED)) {
 	$langs->load("admin");
-	dol_syslog("Call Dolibarr API interfaces with module REST disabled");
+	dol_syslog("Call Dolibarr API interfaces with module API REST disabled");
 	print $langs->trans("WarningAPIExplorerDisabled").'.<br><br>';
 	//session_destroy();
 	exit(0);
@@ -153,6 +153,10 @@ preg_match('/index\.php\/([^\/]+)(.*)$/', $url, $reg);
 $refreshcache = (empty($conf->global->API_PRODUCTION_DO_NOT_ALWAYS_REFRESH_CACHE) ? true : false);
 if (!empty($reg[1]) && $reg[1] == 'explorer' && ($reg[2] == '/swagger.json' || $reg[2] == '/swagger.json/root' || $reg[2] == '/resources.json' || $reg[2] == '/resources.json/root')) {
 	$refreshcache = true;
+	if (!is_writable($conf->api->dir_temp)) {
+		print 'Erreur temp dir api/temp not writable';
+		exit(0);
+	}
 }
 
 $api = new DolibarrApi($db, '', $refreshcache);