diff --git a/include/nana/gui/widgets/skeletons/text_token_stream.hpp b/include/nana/gui/widgets/skeletons/text_token_stream.hpp
index a34183ce..3807ac16 100644
--- a/include/nana/gui/widgets/skeletons/text_token_stream.hpp
+++ b/include/nana/gui/widgets/skeletons/text_token_stream.hpp
@@ -665,8 +665,7 @@ namespace nana{ namespace widgets{	namespace skeletons
 				case token::eof:
 					return;
 				default:
-					int * debug = 0;	//for debug.
-					*debug = 0;
+					throw std::runtime_error("invalid token");
 				}
 			}
 		}
diff --git a/source/gui/detail/window_manager.cpp b/source/gui/detail/window_manager.cpp
index 0af79eb8..2fedf0d7 100644
--- a/source/gui/detail/window_manager.cpp
+++ b/source/gui/detail/window_manager.cpp
@@ -293,7 +293,7 @@ namespace detail
 			auto result = native_interface::create_window(native, nested, r, app);
 			if (result.native_handle)
 			{
-				core_window_t* wd = new core_window_t(owner, widget_notifier_interface::get_notifier(wdg), (category::root_tag**)nullptr);
+				auto wd = new core_window_t(owner, widget_notifier_interface::get_notifier(wdg), (category::root_tag**)nullptr);
 				if (nested)
 				{
 					wd->owner = nullptr;
diff --git a/source/gui/widgets/skeletons/text_editor.cpp b/source/gui/widgets/skeletons/text_editor.cpp
index 09a1c556..3a594643 100644
--- a/source/gui/widgets/skeletons/text_editor.cpp
+++ b/source/gui/widgets/skeletons/text_editor.cpp
@@ -1312,7 +1312,7 @@ namespace nana{	namespace widgets
 
 		void text_editor::set_highlight(const std::string& name, const ::nana::color& fgcolor, const ::nana::color& bgcolor)
 		{
-			if (fgcolor.invisible() && fgcolor.invisible())
+			if (fgcolor.invisible() && bgcolor.invisible())
 			{
 				keywords_->schemes.erase(name);
 				return;
@@ -3259,7 +3259,7 @@ namespace nana{	namespace widgets
 							else if (pos <= a.x && a.x < str_end)
 							{	//Partial selected
 								int endpos = static_cast<int>(b.x < str_end ? b.x : str_end);
-								std::unique_ptr<unsigned> pxbuf_ptr(new unsigned[len]);
+								std::unique_ptr<unsigned[]> pxbuf_ptr(new unsigned[len]);
 								unsigned * pxbuf = pxbuf_ptr.get();
 								if (graph_.glyph_pixels(ent.begin, len, pxbuf))
 								{