diff --git a/packages/moxxmpp/lib/src/xeps/xep_0045/errors.dart b/packages/moxxmpp/lib/src/xeps/xep_0045/errors.dart
index f1771ac..7cc2b8f 100644
--- a/packages/moxxmpp/lib/src/xeps/xep_0045/errors.dart
+++ b/packages/moxxmpp/lib/src/xeps/xep_0045/errors.dart
@@ -12,3 +12,8 @@ class InvalidDiscoInfoResponse extends MUCError {}
 /// Returned when no nickname was specified from the client side while trying to
 /// perform some actions on the MUC, such as joining the room.
 class NoNicknameSpecified extends MUCError {}
+
+/// This error occurs when a user attempts to perform an action that requires
+/// them to be a member of a room, but they are not currently joined to
+/// that room.
+class RoomNotJoinedError extends MUCError {}
diff --git a/packages/moxxmpp/lib/src/xeps/xep_0045/xep_0045.dart b/packages/moxxmpp/lib/src/xeps/xep_0045/xep_0045.dart
index b6a7859..80c50a4 100644
--- a/packages/moxxmpp/lib/src/xeps/xep_0045/xep_0045.dart
+++ b/packages/moxxmpp/lib/src/xeps/xep_0045/xep_0045.dart
@@ -97,6 +97,9 @@ class MUCManager extends XmppManagerBase {
       _mucRoomCache.remove(roomJid);
       return nick;
     });
+    if (nick == null) {
+      return Result(RoomNotJoinedError);
+    }
     await getAttributes().sendStanza(
       StanzaDetails(
         Stanza.presence(