diff --git a/server/utils.js b/server/utils.js
index 5e9b277..5a1ed77 100755
--- a/server/utils.js
+++ b/server/utils.js
@@ -174,11 +174,17 @@ function getPostData(request) {
 }
 
 function encrypt(string){
-	return CryptoJS.AES.encrypt(string,config.key).toString();
+	if(string != undefined && string != null)
+		return CryptoJS.AES.encrypt(string,config.key).toString();
+	else
+		return '';
 }
 
 function decrypt(string){
-	return CryptoJS.AES.decrypt(string, config.key).toString(CryptoJS.enc.Utf8);
+	if(string != undefined && string != null)
+		return CryptoJS.AES.decrypt(string, config.key).toString(CryptoJS.enc.Utf8);
+	else
+		return '';
 }
 
 module.exports = {