From caf9632733af2769560e3e1e8974f43bcc66001b Mon Sep 17 00:00:00 2001
From: Paul Natsuo Kishimoto <mail@paul.kishimoto.name>
Date: Wed, 15 Jul 2020 13:02:59 +0200
Subject: [PATCH] =?UTF-8?q?Copy=20indexers=20dict=20in=20reporting?=
 =?UTF-8?q?=E2=80=A6AttrSeries.sel?=
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---
 ixmp/reporting/attrseries.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ixmp/reporting/attrseries.py b/ixmp/reporting/attrseries.py
index 9dd18cb46..311eb6075 100644
--- a/ixmp/reporting/attrseries.py
+++ b/ixmp/reporting/attrseries.py
@@ -96,7 +96,7 @@ def rename(self, new_name_or_name_dict):
 
     def sel(self, indexers=None, drop=False, **indexers_kwargs):
         """Like :meth:`xarray.DataArray.sel`."""
-        indexers = indexers or {}
+        indexers = indexers.copy() if indexers else {}
         indexers.update(indexers_kwargs)
         if len(indexers) == 1:
             level, key = list(indexers.items())[0]