diff --git a/jill/utils/source_utils.py b/jill/utils/source_utils.py
index ecb97d0..b8b3baa 100644
--- a/jill/utils/source_utils.py
+++ b/jill/utils/source_utils.py
@@ -99,7 +99,7 @@ def get_url(self, plain_version, system, architecture):
         url_list = [t.substitute(**configs) for t in template_lists]
         url_list.sort(key=lambda url:
                       self.latencies[urlparse(url).netloc])
-        return url_list[0]
+        return url_list[0] if url_list else ""
 
 
 def read_registry():
@@ -184,6 +184,7 @@ def _get_urls(self, plain_version, system, architecture):
         """
         url_list = [src.get_url(plain_version, system, architecture)
                     for src in self.registry.values()]
+        url_list = [url for url in url_list if url]
         url_list.sort(key=lambda url:
                       self.latencies[urlparse(url).netloc])
         return url_list
diff --git a/setup.py b/setup.py
index b63d7da..e882ed6 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@
 
 setuptools.setup(
     name='jill',
-    version='0.6.10',
+    version='0.6.11',
     author="Johnny Chen",
     author_email="johnnychen94@hotmail.com",
     description="JILL -- Julia Installer for Linux (MacOS, Windows and FreeBSD) -- Light",