diff --git a/node_modules/rttc/lib/helpers/types.js b/node_modules/rttc/lib/helpers/types.js
index a11279d..1181562 100644
--- a/node_modules/rttc/lib/helpers/types.js
+++ b/node_modules/rttc/lib/helpers/types.js
@@ -460,9 +460,11 @@ var TYPES = {
       }
       // Reject RttcRefPlaceholders
       // (this is a special case so there is a placeholder value that ONLY validates against the "ref" type)
-      if (_.isObject(v) && v.constructor.name === 'RttcRefPlaceholder') {
+
+      if (_.isObject(v) &&  v.constructor  &&  v.constructor.name === 'RttcRefPlaceholder') {
         return false;
       }
+
       if (_.isString(v) || _.isNumber(v) || _.isBoolean(v) || _.isPlainObject(v) || _.isArray(v) || _.isNull(v)) {
         return true;
       }