Nothing special here

On websocket:
https://github.com/kataras/iris/issues/340#issuecomment-237612680

iris.go

@@ -1820,7 +1820,6 @@ func (api *muxAPI) Favicon(favPath string, requestPath ...string) RouteNameFunc
 	if len(requestPath) > 0 {
 		reqPath = requestPath[0]
 	}
-
 	api.Head(reqPath, h)
 	return api.Get(reqPath, h)
 }

template.go

@@ -104,6 +104,15 @@ type (
 // Directory sets the directory to load from
 // returns the Binary location which is optional
 func (t *TemplateEngineLocation) Directory(dir string, fileExtension string) *TemplateEngineBinaryLocation {
+	if dir == "" {
+		dir = DefaultTemplateDirectory // the default templates dir
+	}
+	if fileExtension == "" {
+		fileExtension = DefaultTemplateExtension
+	} else if fileExtension[0] != '.' { // if missing the start dot
+		fileExtension = "." + fileExtension
+	}
+
 	t.directory = dir
 	t.extension = fileExtension
 	return &TemplateEngineBinaryLocation{location: t}
@@ -111,6 +120,10 @@ func (t *TemplateEngineLocation) Directory(dir string, fileExtension string) *Te
 
 // Binary sets the asset(s) and asssets names to load from, works with Directory
 func (t *TemplateEngineBinaryLocation) Binary(assetFn func(name string) ([]byte, error), namesFn func() []string) {
+	if assetFn == nil || namesFn == nil {
+		return
+	}
+
 	t.location.assetFn = assetFn
 	t.location.namesFn = namesFn
 	// if extension is not static(setted by .Directory)

websocket.go

@@ -201,7 +201,9 @@ func (s *websocketServer) serve() {
 		case join := <-s.join:
 			s.joinRoom(join.roomName, join.websocketConnectionID)
 		case leave := <-s.leave:
-			s.leaveRoom(leave.roomName, leave.websocketConnectionID)
+			if _, found := s.websocketConnections[leave.websocketConnectionID]; found {
+				s.leaveRoom(leave.roomName, leave.websocketConnectionID)
+			}
 		case msg := <-s.messages: // message received from the websocketConnection
 			if msg.to != All && msg.to != NotMe && s.rooms[msg.to] != nil {
 				// it suppose to send the message to a room