diff --git a/lua/nvim-tree/view.lua b/lua/nvim-tree/view.lua
index 218ff96e..c7dd9b12 100644
--- a/lua/nvim-tree/view.lua
+++ b/lua/nvim-tree/view.lua
@@ -226,7 +226,7 @@ end
 function M.focus(winnr, open_if_closed)
   local wnr = winnr or M.get_winnr()
 
-  if a.nvim_win_get_tabpage(wnr) ~= a.nvim_win_get_tabpage(0) then
+  if a.nvim_win_get_tabpage(wnr or 0) ~= a.nvim_win_get_tabpage(0) then
     M.close()
     M.open()
     wnr = M.get_winnr()