Fixed issue with wow classic.

Author: neotron

BulkMailInbox.lua

@@ -314,8 +314,9 @@ function mod:OnEnable()
     self:RegisterEvent('PLAYER_ENTERING_WORLD')
     self:RegisterEvent('UI_ERROR_MESSAGE')
     self:RegisterEvent('MAIL_INBOX_UPDATE')
-    self:RegisterEvent('PLAYER_INTERACTION_MANAGER_FRAME_HIDE')
-
+    if not _G.GetContainerItemInfo then
+        self:RegisterEvent('PLAYER_INTERACTION_MANAGER_FRAME_HIDE')
+    end
     -- Handle being LoD loaded while at the mailbox
     if MailFrame:IsVisible() then
         self:MAIL_SHOW()