diff --git a/find_duplicate_files/find_duplicate_files.py b/find_duplicate_files/find_duplicate_files.py
index 9ab8b6a..8507c40 100644
--- a/find_duplicate_files/find_duplicate_files.py
+++ b/find_duplicate_files/find_duplicate_files.py
@@ -55,7 +55,7 @@ class find_duplicate_files:
     def _check_file_cache(self, file):
         result = self.cur.execute(f"SELECT hash FROM files WHERE file = '{file}'")
         row = result.fetchone()
-        if len(row) > 0:
+        if row and len(row) > 0:
             return row[0]
         else:
             return False