From 10df3978b0aec1f6a1c7e6491149c73edf1d6f6c Mon Sep 17 00:00:00 2001
From: Joni Herttuainen <joni.herttuainen@epfl.ch>
Date: Thu, 4 Jan 2024 13:37:30 +0100
Subject: [PATCH] return False in _positional mask if no ids

---
 bluepysnap/query.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bluepysnap/query.py b/bluepysnap/query.py
index f09b1178..b8d404ce 100644
--- a/bluepysnap/query.py
+++ b/bluepysnap/query.py
@@ -100,6 +100,8 @@ def _positional_mask(data, ids):
         return True
     if isinstance(ids, int):
         ids = [ids]
+    elif len(ids) == 0:
+        return False
     mask = np.full(len(data), fill_value=False)
     indices = data.index.get_indexer(ids)
     mask[indices[indices > -1]] = True