From 67ef7411a0e7add1192c23aa6fd63eb299e8217e Mon Sep 17 00:00:00 2001
From: David Lord <davidism@gmail.com>
Date: Mon, 17 May 2021 15:52:51 -0700
Subject: [PATCH] convert `HTTPException.description` to string

---
 CHANGES.rst                | 2 ++
 src/werkzeug/exceptions.py | 9 ++++++++-
 tests/test_exceptions.py   | 4 ++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index 8a8af6e9b..7444a2014 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -16,6 +16,8 @@ Unreleased
     characters. :issue:`2125`
 -   Type checking understands that calling ``headers.get`` with a string
     default will always return a string. :issue:`2128`
+-   If ``HTTPException.description`` is not a string,
+    ``get_description`` will convert it to a string. :issue:`2115`
 
 
 Version 2.0.0
diff --git a/src/werkzeug/exceptions.py b/src/werkzeug/exceptions.py
index 7c43d85ef..a3e3b0796 100644
--- a/src/werkzeug/exceptions.py
+++ b/src/werkzeug/exceptions.py
@@ -156,7 +156,14 @@ def get_description(
         scope: t.Optional[dict] = None,
     ) -> str:
         """Get the description."""
-        description = escape(self.description).replace("\n", "<br>")  # type: ignore
+        if self.description is None:
+            description = ""
+        elif not isinstance(self.description, str):
+            description = str(self.description)
+        else:
+            description = self.description
+
+        description = escape(description).replace("\n", "<br>")
         return f"<p>{description}</p>"
 
     def get_body(
diff --git a/tests/test_exceptions.py b/tests/test_exceptions.py
index 12ea8b920..2a6839057 100644
--- a/tests/test_exceptions.py
+++ b/tests/test_exceptions.py
@@ -142,3 +142,7 @@ class TestResponse(Response):
     exc = cls(response=TestResponse())
     rp = exc.get_response({})
     assert isinstance(rp, TestResponse)
+
+
+def test_description_none():
+    HTTPException().get_response()