How to Switch to Previous Workspace after Closing Final Tab

[iton0]

What Operating System(s) are you running on?

Linux X11

Which Wayland compositor or X11 Window manager(s) are you using?

No response

WezTerm version

20240812-215703-30345b36

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I am trying to create a keymap such that when I close out of the final tab of the current workspace it will switch to the previous workspace (via a global previous_workspace variable). Here is the code:

  {
    mods = 'LEADER',
    key = 'x',
    action = wezterm.action_callback(function(window, pane)
      local current_workspace = window:active_workspace()
      local workspace = wezterm.GLOBAL.previous_workspace
      local tabs = window:mux_window():tabs()

      wezterm.log_info('Current workspace: ' .. (current_workspace or 'nil'))
      wezterm.log_info('Previous workspace: ' .. (workspace or 'nil'))
      wezterm.log_info('Number of tabs: ' .. #tabs)

      if #tabs == 1 then
        window:perform_action(act.CloseCurrentTab({ confirm = true }), pane)
        window:perform_action(act.SwitchToWorkspace({ name = workspace }), pane) -- !!! ERROR HERE !!!
        wezterm.GLOBAL.previous_workspace = nil
      else
        window:perform_action(act.CloseCurrentTab({ confirm = true }), pane)
      end
    end),
  },

However I get this error (the code also has a comment showing what produces the error):
16:20:51.045 ERROR wezterm_gui::termwindow > while processing user-defined-1 event: pane id 172 is not valid stack traceback: [C]: in local 'poll' [string "?"]:4: in method 'perform_action' [string "/home/iton/.config/wezterm/wezterm.lua"]:113: in function <[string "/home/iton/.config/wezterm/wezterm.lua"]:101>

I understand why I am getting the error but am unsure how to properly access the previous workspace.