diff --git a/src/Main/Base/Project/Dom/ClassBrowser/MemberTreeNode.cs b/src/Main/Base/Project/Dom/ClassBrowser/MemberTreeNode.cs
index aa238c070c..bfad051b57 100644
--- a/src/Main/Base/Project/Dom/ClassBrowser/MemberTreeNode.cs
+++ b/src/Main/Base/Project/Dom/ClassBrowser/MemberTreeNode.cs
@@ -71,9 +71,9 @@ namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
 		
 		public override void ShowContextMenu()
 		{
-			var model = this.Model;
-			if (model is IEntityModel) {
-				var ctx = MenuService.ShowContextMenu(null, (IEntityModel) model, "/SharpDevelop/EntityContextMenu");
+			var entityModel = this.Model as IEntityModel;
+			if ((entityModel != null) && (entityModel.ParentProject != null)) {
+				var ctx = MenuService.ShowContextMenu(null, entityModel, "/SharpDevelop/EntityContextMenu");
 			}
 		}
 	}
diff --git a/src/Main/Base/Project/Dom/ClassBrowser/TypeDefinitionTreeNode.cs b/src/Main/Base/Project/Dom/ClassBrowser/TypeDefinitionTreeNode.cs
index 1ab7e74628..d1a36f5d9b 100644
--- a/src/Main/Base/Project/Dom/ClassBrowser/TypeDefinitionTreeNode.cs
+++ b/src/Main/Base/Project/Dom/ClassBrowser/TypeDefinitionTreeNode.cs
@@ -59,9 +59,9 @@ namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
 		
 		public override void ShowContextMenu()
 		{
-			var model = this.Model;
-			if (model is IEntityModel) {
-				var ctx = MenuService.ShowContextMenu(null, (IEntityModel) model, "/SharpDevelop/EntityContextMenu");
+			var entityModel = this.Model as IEntityModel;
+			if ((entityModel != null) && (entityModel.ParentProject != null)) {
+				var ctx = MenuService.ShowContextMenu(null, entityModel, "/SharpDevelop/EntityContextMenu");
 			}
 		}
 	}