diff --git a/.gitignore b/.gitignore
index 40f7cbb..579043d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,4 +46,5 @@ Network Trash Folder
 Temporary Items
 .apdisk
 
-test
\ No newline at end of file
+test
+node_modules
diff --git a/lib/modules/service-device.js b/lib/modules/service-device.js
index 180ff8f..c1c50b4 100644
--- a/lib/modules/service-device.js
+++ b/lib/modules/service-device.js
@@ -497,7 +497,7 @@ OnvifServiceDevice.prototype.setDNS = function(params, callback) {
 				reject(new Error('The "SearchDomain" property was invalid: ' + err_msg));
 				return;
 			}
-			for(let i=0; i<params['SearchDomain']; i++) {
+			for(let i=0; i<params['SearchDomain'].length; i++) {
 				if(err_msg = mOnvifSoap.isInvalidValue(params['SearchDomain'][i], 'string')) {
 					reject(new Error('The "SearchDomain" property was invalid: ' + err_msg));
 					return;