diff --git a/ExtensionCrawler/cdnjs_git.py b/ExtensionCrawler/cdnjs_git.py
index 2642be4..382bcb3 100644
--- a/ExtensionCrawler/cdnjs_git.py
+++ b/ExtensionCrawler/cdnjs_git.py
@@ -60,8 +60,10 @@ def pull_get_list_changed_files(gitrepo):
     for single_fetch_info in fetch_info:
         for diff in single_fetch_info.commit.diff(
                 single_fetch_info.old_commit):
-            if not diff.a_blob.path in files:
-                files.append(diff.a_blob.path)
+            logging.debug("Found diff: " + str(diff))
+            if not diff.a_blob is None:
+                if not diff.a_blob.path in files:
+                    files.append(diff.a_blob.path)
     return files
 
 def normalize_jsdata(str_data):
@@ -221,6 +223,9 @@ def pull_get_updated_lib_files(cdnjs_git_path):
     libvers = set()
     files = []
     cdnjs_repo = git.Repo(cdnjs_git_path)
+    logging.info(" HEAD: " + str(cdnjs_repo.head.commit))
+    logging.info("   is detached: " + str(cdnjs_repo.head.is_detached))
+    logging.info("   is dirty: " + str(cdnjs_repo.is_dirty()))
     for update in pull_get_list_changed_files(cdnjs_repo):
         if not (os.path.basename(update) in ["package.json", ".gitkeep"]):
             if update.startswith("ajax"):