diff --git a/lib/models/templates.js b/lib/models/templates.js
index b0f0099e..cabcbeb0 100644
--- a/lib/models/templates.js
+++ b/lib/models/templates.js
@@ -62,6 +62,9 @@ module.exports.create = (template, callback) => {
 
     Object.keys(template).forEach(key => {
         let value = template[key];
+        if(value === null) {
+            value = '';
+        }
         key = tools.toDbKey(key);
         if (!allowedKeys.includes(key)) {
             return;