--- a/plugins/muc/muc.lib.lua	Wed Mar 11 21:15:01 2020 +0100
+++ b/plugins/muc/muc.lib.lua	Thu Mar 12 20:32:07 2020 +0000
@@ -1449,6 +1449,7 @@
 		frozen = {
 			_jid = self.jid;
 			_data = self._data;
+			_affiliation_data = self._affiliation_data;
 		};
 		for user, affiliation in pairs(self._affiliations) do
 			frozen[user] = affiliation;