fix issue #3636

app/modules/projects/project/project.controller.coffee

@@ -36,9 +36,9 @@ class ProjectController
         @appMetaService.setfn @._setMeta.bind(this)
 
     _setMeta: (project)->
-        metas = {}
+        return null if !@.project
 
-        return metas if !@.project
+        metas = {}
 
         ctx = {projectName: @.project.get("name")}
 

app/modules/services/app-meta.service.coffee

@@ -97,7 +97,8 @@ class AppMetaService
         @._listener() if @.listener
 
         @._listener = @rootScope.$watchCollection fn, (metas) =>
-            @.setAll(metas.title, metas.description)
-
+            if metas
+                @.setAll(metas.title, metas.description)
+                @._listener()
 
 angular.module("taigaCommon").service("tgAppMetaService", AppMetaService)