From b4cad15296e77f735bf300163d1e18f4fbb6b45e Mon Sep 17 00:00:00 2001
From: Mingi Kang <59556369+kangmg@users.noreply.github.com>
Date: Thu, 29 Jan 2026 05:37:13 +0000
Subject: [PATCH] safe load os.environ to prevent KeyError

---
 pyxtal/XRD.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyxtal/XRD.py b/pyxtal/XRD.py
index 3f072044..7b88306c 100644
--- a/pyxtal/XRD.py
+++ b/pyxtal/XRD.py
@@ -536,7 +536,7 @@ def plotly_pxrd(
             title="PXRD of " + self.name,
         )
 
-        if os.environ["_"].find("jupyter") == -1:
+        if os.environ.get("_", "").find("jupyter") == -1:
             if html is None:
                 return fig.to_html()
             else: