--- a/PluginMqttMonitor.py	Wed Apr 08 18:06:28 2020 +0200
+++ b/PluginMqttMonitor.py	Wed Apr 08 19:09:36 2020 +0200
@@ -26,7 +26,7 @@
 author = "Detlev Offenbach <detlev@die-offenbachs.de>"
 autoactivate = True
 deactivateable = True
-version = "1.2.1"
+version = "1.2.2"
 className = "MqttMonitorPlugin"
 packageName = "MqttMonitor"
 shortDescription = "Plug-in implementing a tool to connect to a MQTT broker"
@@ -134,7 +134,7 @@
             usesDarkPalette = e5App().usesDarkPalette()
         except AttributeError:
             from PyQt5.QtGui import QPalette
-            palette = self.palette()
+            palette = e5App().palette()
             lightness = palette.color(QPalette.Window).lightness()
             usesDarkPalette = lightness <= 128
         if usesDarkPalette: