Merge pull request #410 from dangerismycat/patch-1

Cast substitution values to strings

Author: thinkingserious

lib/helpers/mail/mail.js

@@ -622,8 +622,8 @@ function Personalization() {
     if (this.substitutions === undefined) {
       this.substitutions = {};
     }
-    this.substitutions[Object.keys(substitution)[0]] =
-      substitution[Object.keys(substitution)[0]];
+    var currentKey = Object.keys(substitution)[0];
+    this.substitutions[currentKey] = substitution[currentKey].toString();
   };
 
   this.getSubstitutions = function() {