diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d381547..51dea0f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,7 @@ jobs:
       - name: flake8 Lint
         uses: py-actions/flake8@v2
         with:
+          ignore: "BLK100"
           exclude: "tests/*"
           max-line-length: "128"
           path: "."
diff --git a/pandora-box.py b/pandora-box.py
index 8e19f5a..d80acbb 100755
--- a/pandora-box.py
+++ b/pandora-box.py
@@ -90,9 +90,9 @@ class PandoraBox:
         """ Convert size to human readble string """
         for unit in ['B', 'KB', 'MB', 'GB', 'TB']:
             if size < 1024.0:
-                break
+                return f"{size:.{decimal_places}f}{unit}"
             size /= 1024.0
-        return f"{size:.{decimal_places}f}{unit}"
+        return None
 
     # -----------------------------------------------------------
     # Image Screen