diff --git a/lib/inflection.js b/lib/inflection.js
index 29172eb..2d89839 100644
--- a/lib/inflection.js
+++ b/lib/inflection.js
@@ -119,6 +119,7 @@ var inflection = new (function () {
     setPlural(/(quiz)$/i, "$1zes");
 
     setSingular(/s$/i, "")
+		setSingular(/ss$/i, "ss")
     setSingular(/(n)ews$/i, "$1ews")
     setSingular(/([ti])a$/i, "$1um")
     setSingular(/((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$/i, "$1$2sis")
diff --git a/lib/string.js b/lib/string.js
index b897c2f..dc2c4da 100644
--- a/lib/string.js
+++ b/lib/string.js
@@ -412,7 +412,7 @@ string = new (function () {
     }
     else {
       returnString = str.substring(0, last) + opts.omission;
-      returnString += callback ? callback() : '';
+      returnString += callback && typeof callback === 'function' ? callback() : '';
       return returnString;
     }
   };
@@ -719,7 +719,8 @@ string = new (function () {
     initialCap = opts.initialCap;
 
     var self = this
-      , normalizedName = this.snakeize(name)
+        // Use plural version to fix possible mistakes(e,g,. thingie instead of thingy)
+      , normalizedName = this.snakeize(inflection.pluralize(name))
       , nameSingular = inflection.singularize(normalizedName)
       , namePlural = inflection.pluralize(normalizedName);