diff --git a/pilot/util/container.py b/pilot/util/container.py
index d5483659..d4b1c627 100644
--- a/pilot/util/container.py
+++ b/pilot/util/container.py
@@ -119,9 +119,11 @@ def read_output(stream, queue):
                 if not line:
                     break
             except (AttributeError, ValueError):
+                # Handle the case where stream is None (AttributeError) or closed (ValueError)
                 break
             except OSError as e:
                 if e.errno == errno.EBADF:
+                    # Handle the case where the file descriptor is bad
                     break
                 else:
                     raise