diff --git a/ui/events.lua b/ui/events.lua
index 50dcd48..a5300b7 100644
--- a/ui/events.lua
+++ b/ui/events.lua
@@ -248,7 +248,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
             if #mail.selected_idxs.sent[name] >= #getOutbox() then -- if selection is full
                 mail.selected_idxs.sent[name] = {}
             else
-                mail.selected_idxs.inbox[name] = {} -- reset to avoid duplicates
+                mail.selected_idxs.sent[name] = {} -- reset to avoid duplicates
                 mail.selected_idxs.multipleselection[name] = true
                 for _, msg in ipairs(getOutbox()) do
                     table.insert(mail.selected_idxs.sent[name], msg.id)