diff --git a/Program.cs b/Program.cs
index bc2a25e..6990dc1 100644
--- a/Program.cs
+++ b/Program.cs
@@ -814,6 +814,7 @@ namespace Bot
         }
         private static void ReloadGroupsCache()
         {
+            GroupsCache = new Dictionary<UUID, Group>();
             client.Groups.CurrentGroups += Groups_CurrentGroups;
             client.Groups.RequestCurrentGroups();
             GroupsEvent.WaitOne(10000, false);