diff --git a/rjp++/include/object.hpp b/rjp++/include/object.hpp
index 77af75d..23b80d7 100644
--- a/rjp++/include/object.hpp
+++ b/rjp++/include/object.hpp
@@ -134,7 +134,7 @@ namespace rjp{
 		const_iterator begin(void)const;
 		iterator end(void)const;
 
-		value search(const rexy::string_base& key);
+		value search(const rexy::string_base& key)const;
 
 	private:
 		RJP_value* add_member_impl(const rexy::string_base& key);
diff --git a/rjp++/src/array.cpp b/rjp++/src/array.cpp
index fabce9c..85adf7e 100644
--- a/rjp++/src/array.cpp
+++ b/rjp++/src/array.cpp
@@ -27,12 +27,16 @@ namespace rjp{
 	array::array(const value& val):
 		value(val)
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_array)
 			rjp_set_array(m_value);
 	}
 	array::array(value&& val):
 		value(std::move(val))
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_array)
 			rjp_set_array(m_value);
 	}
diff --git a/rjp++/src/integral.cpp b/rjp++/src/integral.cpp
index 95b48ff..88bed89 100644
--- a/rjp++/src/integral.cpp
+++ b/rjp++/src/integral.cpp
@@ -29,12 +29,16 @@ namespace rjp{
 	integer::integer(const value& val):
 		value(val)
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_integer)
 			rjp_set_int(m_value, rjp_get_int(val.raw()));
 	}
 	integer::integer(value&& val):
 		value(std::move(val))
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_integer)
 			rjp_set_int(m_value, rjp_get_int(m_value));
 	}
@@ -62,12 +66,16 @@ namespace rjp{
 	dfloat::dfloat(const value& val):
 		value(val)
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_dfloat)
 			rjp_set_float(m_value, rjp_get_float(val.raw()));
 	}
 	dfloat::dfloat(value&& val):
 		value(std::move(val))
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_dfloat)
 			rjp_set_float(m_value, rjp_get_float(m_value));
 	}
@@ -96,12 +104,16 @@ namespace rjp{
 	boolean::boolean(const value& val):
 		value(val)
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_boolean)
 			rjp_set_bool(m_value, rjp_get_bool(val.raw()));
 	}
 	boolean::boolean(value&& val):
 		value(std::move(val))
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_boolean)
 			rjp_set_bool(m_value, rjp_get_bool(m_value));
 	}
@@ -128,6 +140,8 @@ namespace rjp{
 	null::null(const value& val):
 		value(val)
 	{
+		if(!m_value)
+			return;
 		rjp_set_null(m_value);
 	}
 	null::null(value&& val):
diff --git a/rjp++/src/object.cpp b/rjp++/src/object.cpp
index edf66d4..51a6f12 100644
--- a/rjp++/src/object.cpp
+++ b/rjp++/src/object.cpp
@@ -26,12 +26,16 @@ namespace rjp{
 	object::object(const value& val):
 		value(val)
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_object)
 			rjp_set_object(m_value);
 	}
 	object::object(value&& val):
 		value(std::move(val))
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_object)
 			rjp_set_object(m_value);
 	}
@@ -118,7 +122,7 @@ namespace rjp{
 	object::iterator object::end(void)const{
 		return iterator();
 	}
-	value object::search(const rexy::string_base& key){
+	value object::search(const rexy::string_base& key)const{
 		RJP_value* result = rjp_search_member(m_value, key.get());
 		return create_unmanaged(result);
 	}
diff --git a/rjp++/src/string_val.cpp b/rjp++/src/string_val.cpp
index a82f2b3..0200931 100644
--- a/rjp++/src/string_val.cpp
+++ b/rjp++/src/string_val.cpp
@@ -34,12 +34,16 @@ namespace rjp{
 	string_val::string_val(const value& val):
 		value(val)
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_string)
 			rjp_set_string(m_value, "", 0);
 	}
 	string_val::string_val(value&& val):
 		value(std::move(val))
 	{
+		if(!m_value)
+			return;
 		if(rjp_value_type(m_value) != rjp_json_string)
 			rjp_set_string(m_value, "", 0);
 	}