diff --git a/src/inja.hpp b/src/inja.hpp
index 8ba0b36..5be664f 100644
--- a/src/inja.hpp
+++ b/src/inja.hpp
@@ -72,7 +72,7 @@ public:
 	Regex(): std::regex() {}
 	explicit Regex(const std::string& pattern): std::regex(pattern, std::regex_constants::ECMAScript), pattern_(pattern) { }
 
-	std::string pattern() { return pattern_; }
+	std::string pattern() const { return pattern_; }
 };
 
 
@@ -196,6 +196,7 @@ inline MatchClosed search_closed_on_level(const std::string& input, const Regex&
 		if (std::regex_match(inner.cbegin(), inner.cend(), regex_level_up)) { level += 1; }
 		else if (std::regex_match(inner.cbegin(), inner.cend(), regex_level_down)) { level -= 1; }
 
+		if (level < 0) { return MatchClosed(); }
 		match_delimiter = search(input, regex_statement, current_position);
 	}
 
diff --git a/test/src/unit-renderer.cpp b/test/src/unit-renderer.cpp
index ee158f6..b7da3e1 100644
--- a/test/src/unit-renderer.cpp
+++ b/test/src/unit-renderer.cpp
@@ -22,6 +22,7 @@ TEST_CASE("types") {
 	data["relatives"]["mother"] = "Maria";
 	data["relatives"]["brother"] = "Chris";
 	data["relatives"]["sister"] = "Jenny";
+	data["vars"] = {2, 3, 4, 0, -1, -2, -3};
 
 
 	SECTION("basic") {
@@ -52,6 +53,8 @@ TEST_CASE("types") {
 		CHECK( env.render("Hello {% for name in names %}{{ name }} {% endfor %}!", data) == "Hello Jeff Seb !" );
 		CHECK( env.render("Hello {% for name in names %}{{ index }}: {{ name }}, {% endfor %}!", data) == "Hello 0: Jeff, 1: Seb, !" );
 		CHECK( env.render("{% for type, name in relatives %}{{ type }}: {{ name }}, {% endfor %}", data) == "brother: Chris, mother: Maria, sister: Jenny, " );
+		CHECK( env.render("{% for v in vars %}{% if v > 0 %}+{% endif %}{% endfor %}", data) == "+++" );
+		// CHECK( env.render("{% if 1 >= 18 %}test{% endif %}{% for v in vars %}{% if v > 0 %}+{% else %}-{% endif %}{% endfor %}", data) == "+++----" );
 
 		CHECK_THROWS_WITH( env.render("{% for name ins names %}a{% endfor %}", data), "[inja.exception.parser_error] unknown loop statement"  );
 		// CHECK_THROWS_WITH( env.render("{% for name in relatives %}{{ name }}{% endfor %}", data), "[inja.exception.json_error] [json.exception.type_error.302] type must be array, but is object"  );
@@ -69,6 +72,7 @@ TEST_CASE("types") {
 		CHECK( env.render("{% if age in [28, 29, 30] %}True{% endif %}", data) == "True" );
 		CHECK( env.render("{% if age == 28 %}28{% else if age == 29 %}29{% endif %}", data) == "29" );
 		CHECK( env.render("{% if age == 26 %}26{% else if age == 27 %}27{% else if age == 28 %}28{% else %}29{% endif %}", data) == "29" );
+		CHECK( env.render("{% if age == 25 %}+{% endif %}{% if age == 29 %}+{% else %}-{% endif %}", data) == "+" );
 	}
 }