diff --git a/src/click/_compat.py b/src/click/_compat.py
index 9e14ace5f..feb836628 100644
--- a/src/click/_compat.py
+++ b/src/click/_compat.py
@@ -129,7 +129,7 @@ def writable(self) -> bool:
         if x is not None:
             return t.cast(bool, x())
         try:
-            self._stream.write("")  # type: ignore
+            self._stream.write(b"")
         except Exception:
             try:
                 self._stream.write(b"")
diff --git a/src/click/_termui_impl.py b/src/click/_termui_impl.py
index 24dec542e..a6c7e6b36 100644
--- a/src/click/_termui_impl.py
+++ b/src/click/_termui_impl.py
@@ -251,9 +251,9 @@ def render_progress(self) -> None:
             self.width = 0
             clutter_length = term_len(self.format_progress_line())
             new_width = max(0, shutil.get_terminal_size().columns - clutter_length)
-            if new_width < old_width:
+            if new_width < old_width and self.max_width is not None:
                 buf.append(BEFORE_BAR)
-                buf.append(" " * self.max_width)  # type: ignore
+                buf.append(" " * self.max_width)
                 self.max_width = new_width
             self.width = new_width