From 8e5eb7b6d31595d7deea12d2f4fb248e11d61a5e Mon Sep 17 00:00:00 2001
From: George Harker <george@george-graphics.co.uk>
Date: Mon, 4 Nov 2024 21:36:49 -0800
Subject: [PATCH] Initialize callback array

---
 adafruit_neotrellis/multitrellis.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/adafruit_neotrellis/multitrellis.py b/adafruit_neotrellis/multitrellis.py
index fe2023a..5760181 100644
--- a/adafruit_neotrellis/multitrellis.py
+++ b/adafruit_neotrellis/multitrellis.py
@@ -89,6 +89,9 @@ def __init__(self, neotrellis_array: List[List[NeoTrellis]]):
         self._width = col_size_sum[self._cols - 1]
         self._height = row_size_sum[self._rows - 1]
         self._key_pads: List[List[NeoTrellis]] = []
+        self._callbacks: List[List[Optional[CallbackType]]] = [
+            [None for _ in range(self._width)] for _ in range(self._height)
+        ]
 
         for y in range(self._height):
             self._key_pads.append([])