@@ -16,7 +16,10 @@ public class URLTransform<ObjectType, JSONType>: MapperTransform<ObjectType, JSO
 
     override public func transformFromJSON(value: AnyObject?) -> ObjectType? {
         if let URLString = value as? String {
-            return (NSURL(string: URLString) as ObjectType)
+            let url = NSURL(string: URLString)
+            if let unwrappedUrl = url {
+                return (url as ObjectType)
+            }
         }
         return nil
     }
Original file line number	Diff line number	Diff line change
`@@ -16,7 +16,10 @@ public class URLTransform<ObjectType, JSONType>: MapperTransform<ObjectType, JSO`
`16`	`16`
`17`	`17`	`override public func transformFromJSON(value: AnyObject?) -> ObjectType? {`
`18`	`18`	`if let URLString = value as? String {`
`19`		`- return (NSURL(string: URLString) as ObjectType)`
	`19`	`+ let url = NSURL(string: URLString)`
	`20`	`+ if let unwrappedUrl = url {`
	`21`	`+ return (url as ObjectType)`
	`22`	`+ }`
`20`	`23`	`}`
`21`	`24`	`return nil`
`22`	`25`	`}`