diff --git a/ilias_sync2/main.py b/ilias_sync2/main.py
index d402567..2b1c12b 100644
--- a/ilias_sync2/main.py
+++ b/ilias_sync2/main.py
@@ -153,17 +153,21 @@ class CrawlObject():
                 if len(items) == 4:
                     _, name, _, download = items
 
-                    link = download.find("a").attrs["href"]
-                    name = name.find("a").text + ".mp4"  # rough estimate that all files are mp4
-                    url = urljoin(self.url, link)
+                    
+                    link_element = download.find("a")
+                    name_element = name.find("a")
+                    if link_element is not None and name_element is not None:
+                        link = link_element.attrs["href"]
+                        name = name_element.text + ".mp4"  # rough estimate that all files are mp4
+                        url = urljoin(self.url, link)
 
-                    path = self.path / name
+                        path = self.path / name
 
-                    if url in self.discovered:
-                        logging.info(f"{ url } already discovered, skipping it")
-                        continue
-                    self.discovered.add(url)
-                    subitems.append(CrawlObject(path, url, self.session, discovered=self.discovered))
+                        if url in self.discovered:
+                            logging.info(f"{ url } already discovered, skipping it")
+                            continue
+                        self.discovered.add(url)
+                        subitems.append(CrawlObject(path, url, self.session, discovered=self.discovered))
 
             # download things from exercise sections
             exercise_div = content.find("div", class_="ilExcOverview")