From 419d35a893ef03ec02d3f47acc978be0b23b352b Mon Sep 17 00:00:00 2001
From: Tamas Gal <tgal@km3net.de>
Date: Thu, 10 Dec 2020 18:40:09 +0100
Subject: [PATCH] Add hint for later bugfix

---
 km3io/rootio.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/km3io/rootio.py b/km3io/rootio.py
index e49fd63..a03b5d9 100644
--- a/km3io/rootio.py
+++ b/km3io/rootio.py
@@ -187,6 +187,7 @@ class EventReader:
         )  # all top-level keys for regular branches
         log.debug("keys: %s", keys)
         log.debug("aliases: %s", self.aliases)
+        # check for valid keys, e.g. `usr` is not always there and raises recursion error!
         events_it = events.iterate(
             keys, aliases=self.aliases, step_size=self._step_size
         )
-- 
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