From 1b27b26edcb0715f84145f5c974ece4fc16e45a5 Mon Sep 17 00:00:00 2001
From: Luigi Pertoldi <luigi.pertoldi@protonmail.com>
Date: Tue, 9 Apr 2024 16:05:09 +0200
Subject: [PATCH] build_evt(): bug fix

---
 src/pygama/evt/build_evt.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/pygama/evt/build_evt.py b/src/pygama/evt/build_evt.py
index f78a3ff87..20ffa5edc 100644
--- a/src/pygama/evt/build_evt.py
+++ b/src/pygama/evt/build_evt.py
@@ -298,9 +298,9 @@ def build_evt(
                 raise RuntimeError(msg)
 
             # otherwise, increase nesting
-            if level not in nested_tbl:
+            if level not in lvl_ptr:
                 lvl_ptr.add_field(level, Table(size=n_rows))
-            lvl_ptr = nested_tbl[level]
+            lvl_ptr = lvl_ptr[level]
 
     # write output fields into outfile
     if output_fields: