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-rw-r--r--django/db/backends/postgresql/base.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/django/db/backends/postgresql/base.py b/django/db/backends/postgresql/base.py
index d90f0cc225..9d0967fa2b 100644
--- a/django/db/backends/postgresql/base.py
+++ b/django/db/backends/postgresql/base.py
@@ -278,7 +278,7 @@ def typecast_string(s):
"""
Cast all returned strings to unicode strings.
"""
- if not s:
+ if not s and not isinstance(s, str):
return s
return smart_unicode(s)