diff --git a/include/nana/filesystem/filesystem.hpp b/include/nana/filesystem/filesystem.hpp
index c4815c94..83668943 100644
--- a/include/nana/filesystem/filesystem.hpp
+++ b/include/nana/filesystem/filesystem.hpp
@@ -1,7 +1,7 @@
 /**
  *	A ISO C++ filesystem Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -434,8 +434,7 @@ namespace nana  { namespace experimental { namespace filesystem
 	{ return s.type() == file_type::directory ;}
 
 	bool is_directory(const path& p);
-
-    //bool is_directory(const path& p, error_code& ec) noexcept;
+    bool is_directory(const path& p, std::error_code& ec) noexcept;
 
 	inline bool is_regular_file(file_status s) noexcept
 	{
diff --git a/source/filesystem/filesystem.cpp b/source/filesystem/filesystem.cpp
index a61e2f66..4ec85bf5 100644
--- a/source/filesystem/filesystem.cpp
+++ b/source/filesystem/filesystem.cpp
@@ -1,6 +1,6 @@
 /*
  *	A ISO C++ FileSystem Implementation
- *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -995,6 +995,11 @@ namespace nana {	namespace experimental {	namespace filesystem
 			return (status(p).type() == file_type::directory);
 		}
 
+		bool is_directory(const path& p, std::error_code& ec) noexcept
+		{
+			return (status(p, ec).type() == file_type::directory);
+		}
+
 		std::uintmax_t file_size(const path& p)
 		{
 #if defined(NANA_WINDOWS)
diff --git a/source/gui/detail/color_schemes.cpp b/source/gui/detail/color_schemes.cpp
index c0555b6f..3bfea8db 100644
--- a/source/gui/detail/color_schemes.cpp
+++ b/source/gui/detail/color_schemes.cpp
@@ -1,7 +1,7 @@
 /*
 *	Color Schemes
 *	Nana C++ Library(http://www.nanapro.org)
-*	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+*	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
 *
 *	Distributed under the Boost Software License, Version 1.0.
 *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -80,14 +80,14 @@ namespace nana
 
 		color color_proxy::get(const color& default_color) const
 		{
-			if (color_->invisible())
-				return default_color;
-			return *color_;
+			if (color_ && !color_->invisible())
+				return *color_;
+			return default_color;
 		}
 
 		color_proxy::operator color() const
 		{
-			return *color_;
+			return (color_ ? *color_ : color{});
 		}
 	//end class color_proxy