diff --git a/lib/bb/fetch2/__init__.py b/lib/bb/fetch2/__init__.py
index 324eef2..0c0d60d 100644
--- a/lib/bb/fetch2/__init__.py
+++ b/lib/bb/fetch2/__init__.py
@@ -601,6 +601,7 @@ def get_file_checksums(filelist, pn):
     """
 
     def checksum_file(f):
+        if not os.path.isfile(f): return None
         try:
             checksum = _checksum_cache.get_checksum(f)
         except OSError as e: