diff --git a/src/wps/wps_upnp.c b/src/wps/wps_upnp.c
index 6fb3d4c55..f62b49e60 100644
--- a/src/wps/wps_upnp.c
+++ b/src/wps/wps_upnp.c
@@ -227,6 +227,8 @@ void format_date(struct wpabuf *buf)
 
 	t = time(NULL);
 	date = gmtime(&t);
+	if (date == NULL)
+		return;
 	wpabuf_printf(buf, "%s, %02d %s %d %02d:%02d:%02d GMT",
 		      &weekday_str[date->tm_wday * 4], date->tm_mday,
 		      &month_str[date->tm_mon * 4], date->tm_year + 1900,