fix: check if cursor is closed

diff --git a/psycopg/psycopg/cursor.py b/psycopg/psycopg/cursor.py
index cbc1dda9700746f924945c3813d741c9f177a88d..71b66cb9096c4318000f567a3334e61f3a99f99b 100644 (file)
--- a/psycopg/psycopg/cursor.py
+++ b/psycopg/psycopg/cursor.py
@@ -451,6 +451,8 @@ class BaseCursor(Generic[ConnectionType, Row]):
         )
 
     def _check_result(self) -> None:
+        if self._conn.closed:
+            raise e.InterfaceError("the cursor is closed")
         res = self.pgresult
         if not res:
             raise e.ProgrammingError("no result available")