diff --git a/protocols/luci-proto-wireguard/htdocs/luci-static/resources/protocol/wireguard.js b/protocols/luci-proto-wireguard/htdocs/luci-static/resources/protocol/wireguard.js
index 6742f2ab99..ab76326eee 100644
--- a/protocols/luci-proto-wireguard/htdocs/luci-static/resources/protocol/wireguard.js
+++ b/protocols/luci-proto-wireguard/htdocs/luci-static/resources/protocol/wireguard.js
@@ -3,6 +3,9 @@
 'require network';
 
 function validateBase64(section_id, value) {
+	if (value.length == 0)
+		return true;
+
 	if (value.length != 44 || !value.match(/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/))
 		return _('Invalid Base64 key string');