The `_clean_span_descriptions` method calls `re.sub()` on `s["description"]` after checking `if "description" in s`, but `description` can be `None` (spans are created via `to_json()` which always includes `"description": self.description`, even when the description is None). This will raise `TypeError: expected string or bytes-like object, got 'NoneType'`. Since the call to `_clean_span_descriptions` is outside the `capture_internal_exceptions()` context manager, this exception could cause event processing to fail.