             tags[entry.0] = entry.1
         }
         
-        var returnDict : [String: AnyObject] = ["event_id" : self.generateUUID(),
+        let returnDict : [String: AnyObject] = ["event_id" : self.generateUUID(),
             "project"   : self.config.projectId!,
             "timestamp" : self.dateFormatter.stringFromDate(NSDate()),
             "level"     : level.rawValue,

            return nil
        }
        
        var client = RavenClient(config: config!, extra: extra, tags: tags, logger: logger)
        
        if (_RavenClientSharedInstance == nil) {
            _RavenClientSharedInstance = client

        var stacktrace : [AnyObject] = []
        
        if (method != nil && file != nil && line > 0) {
            let frame = ["filename" : file!.lastPathComponent, "function" : method!, "lineno" : line]
            stacktrace = [frame]
        }
        
