1 files changed, 3 insertions, 0 deletions
diff --git a/protocols/luci-proto-ncm/htdocs/luci-static/resources/protocol/ncm.js b/protocols/luci-proto-ncm/htdocs/luci-static/resources/protocol/ncm.js
index 4d2f446793..95b5297811 100644
--- a/protocols/luci-proto-ncm/htdocs/luci-static/resources/protocol/ncm.js
+++ b/protocols/luci-proto-ncm/htdocs/luci-static/resources/protocol/ncm.js
@@ -86,6 +86,9 @@ return network.registerProtocol('ncm', {
 
 		o = s.taboption('general', form.Value, 'apn', _('APN'));
 		o.validate = function(section_id, value) {
+			if (value == null || value == '')
+				return true;
+
 			if (!/^[a-zA-Z0-9\-.]*[a-zA-Z0-9]$/.test(value))
 					return _('Invalid APN provided');