fix #24

mattcg · Dec 16, 2024 · 273c091 · 273c091
1 parent ddc92ff
commit 273c091
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/src/index.js b/src/index.js
@@ -128,7 +128,7 @@ tags.region = function(subtag) {
 };
 
 tags.type = function(subtag, type) {
-	var types = index[subtag.toLowerCase()];
+	var types = typeof subtag === 'string' && index[subtag.toLowerCase()];
 
 	if (types && types[type]) {
 		return new Subtag(subtag, type);

diff --git a/test/src/index-test.js b/test/src/index-test.js
@@ -37,6 +37,10 @@ describe('tags', function () {
 		assert.equal(tags.region('en'), null);
 	});
 
+    it('language() handles undefined argument', function() {
+        assert.ifError(tags.language(undefined));
+    });
+
 	it('language() returns subtag by language', function() {
 		var subtag;