Fixed #18902 -- Made force_bytes properly handle exception input

Thanks Aymeric Augustin for the report and the initial patch.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/utils/encoding.py b/django/utils/encoding.py
index 998cf4f3f7..3b284f3ed0 100644
--- a/django/utils/encoding.py
+++ b/django/utils/encoding.py
@@ -174,7 +174,7 @@ def force_bytes(s, encoding='utf-8', strings_only=False, errors='strict'):
                 # An Exception subclass containing non-ASCII data that doesn't
                 # know how to print itself properly. We shouldn't raise a
                 # further exception.
-                return ' '.join([force_bytes(arg, encoding, strings_only,
+                return b' '.join([force_bytes(arg, encoding, strings_only,
                         errors) for arg in s])
             return six.text_type(s).encode(encoding, errors)
     else: