diff --git a/src/inja.hpp b/src/inja.hpp
index cf46c9e..f8d53c0 100644
--- a/src/inja.hpp
+++ b/src/inja.hpp
@@ -753,7 +753,8 @@ public:
 	}
 
 	std::string render(const std::string& input, json data) {
-		return parse(input).render(data);
+		const std::string text = input;
+		return parse(text).render(data);
 	}
 
 	std::string render_template(const std::string& filename, json data) {
diff --git a/test/src/unit-renderer.cpp b/test/src/unit-renderer.cpp
index 6136a4b..f223a18 100644
--- a/test/src/unit-renderer.cpp
+++ b/test/src/unit-renderer.cpp
@@ -78,8 +78,11 @@ TEST_CASE("functions") {
 		CHECK( env.render("{{ upper(  name  ) }}", data) == "PETER" );
 		CHECK( env.render("{{ upper(city) }}", data) == "NEW YORK" );
 		CHECK( env.render("{{ upper(upper(name)) }}", data) == "PETER" );
+		std::cout << "1" << std::endl;
 		CHECK_THROWS_WITH( env.render("{{ upper(5) }}", data), "[json.exception.type_error.302] type must be string, but is number" );
+		std::cout << "2" << std::endl;
 		CHECK_THROWS_WITH( env.render("{{ upper(true) }}", data), "[json.exception.type_error.302] type must be string, but is boolean" );
+		std::cout << "3" << std::endl;
 	}
 
 	/* SECTION("lower") {