diff -ruN mumble-django/pyweb/mumble/MumbleCtlIce.py mumble-django.new/pyweb/mumble/MumbleCtlIce.py
--- mumble-django/pyweb/mumble/MumbleCtlIce.py	2020-08-14 19:42:55.375078615 +0200
+++ mumble-django.new/pyweb/mumble/MumbleCtlIce.py	2020-08-14 19:50:04.321710768 +0200
@@ -94,6 +94,7 @@
     prop = Ice.createProperties([])
     prop.setProperty("Ice.ImplicitContext", "Shared")
     prop.setProperty("Ice.MessageSizeMax",  "65535")
+    prop.setProperty("Ice.Default.EncodingVersion", "1.0")
 
     idd = Ice.InitializationData()
     idd.properties = prop