fix win32 libpq missing error

diff --git a/psycopg/psycopg/pq/misc.py b/psycopg/psycopg/pq/misc.py
index fe825d699900ad78ab34aad9cf5a8dc986d32ab1..1decf4b79824e3ae9c0bd0c0f0dc1160205e7ac2 100644 (file)
--- a/psycopg/psycopg/pq/misc.py
+++ b/psycopg/psycopg/pq/misc.py
@@ -53,6 +53,8 @@ class PGresAttDesc(NamedTuple):
 def find_libpq_full_path() -> str | None:
     if sys.platform == "win32":
         libname = ctypes.util.find_library("libpq.dll")
+        if libname is None:
+            return None
         libname = str(Path(libname).resolve())
 
     elif sys.platform == "darwin":