From 85bbe0b0948d8f4d30e0416ce374322fddb69994 Mon Sep 17 00:00:00 2001
From: Normann <github@koldrack.com>
Date: Tue, 14 Jan 2025 13:27:51 +0100
Subject: [PATCH] fix for #375 (#377)

* fix for #375

* comment
---
 src/akkudoktoreos/utils/visualize.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/akkudoktoreos/utils/visualize.py b/src/akkudoktoreos/utils/visualize.py
index 35877ab3..3c63ab38 100644
--- a/src/akkudoktoreos/utils/visualize.py
+++ b/src/akkudoktoreos/utils/visualize.py
@@ -5,6 +5,7 @@
 from collections.abc import Sequence
 from typing import Callable, Optional, Union
 
+import matplotlib
 import matplotlib.dates as mdates
 import matplotlib.pyplot as plt
 import numpy as np
@@ -17,6 +18,9 @@
 from akkudoktoreos.utils.datetimeutil import to_datetime
 
 logger = get_logger(__name__)
+matplotlib.use(
+    "Agg"
+)  # non-interactive backend that can only write to files, backend needed to stay in main thread.
 
 
 class VisualizationReport(ConfigMixin):