diff --git a/src/prompt_toolkit/history.py b/src/prompt_toolkit/history.py
index 764a8d657..662e10460 100644
--- a/src/prompt_toolkit/history.py
+++ b/src/prompt_toolkit/history.py
@@ -300,7 +300,7 @@ def store_string(self, string: str) -> None:
         with open(self.filename, "ab") as f:
 
             def write(t: str) -> None:
-                f.write(t.encode("utf-8"))
+                f.write(t.encode("utf-8", errors="replace"))
 
             write(f"\n# {datetime.datetime.now()}\n")
             for line in string.split("\n"):
diff --git a/src/prompt_toolkit/widgets/base.py b/src/prompt_toolkit/widgets/base.py
index d2bcacf2e..6c59fa8ea 100644
--- a/src/prompt_toolkit/widgets/base.py
+++ b/src/prompt_toolkit/widgets/base.py
@@ -209,7 +209,7 @@ def __init__(
         if input_processors is None:
             input_processors = []
 
-        # Writeable attributes.
+        # Writable attributes.
         self.completer = completer
         self.complete_while_typing = complete_while_typing
         self.lexer = lexer