diff --git a/cc2dataset/main.py b/cc2dataset/main.py
index 8e4283c..81656d2 100644
--- a/cc2dataset/main.py
+++ b/cc2dataset/main.py
@@ -106,6 +106,8 @@ def extract_domain(url):
 for extractor in FILTERED_EXTRACTORS.values():
     for url in extract_test(extractor):
         domain = extract_domain(url)
+        if domain == "":
+            continue
         if domain in DOMAIN_IES_DICT:
             if extractor not in DOMAIN_IES_DICT[domain]:
                 DOMAIN_IES_DICT[domain] = DOMAIN_IES_DICT[domain] + [extractor]
@@ -113,7 +115,6 @@ def extract_domain(url):
             DOMAIN_IES_DICT[domain] = [extractor]
 
 
-
 def is_link_suitable(link, extractors):
     """Check if link is valid given an extractor."""
     try: