diff --git a/lua/cmp/utils/window.lua b/lua/cmp/utils/window.lua
index 80fb9f5..3779aa2 100644
--- a/lua/cmp/utils/window.lua
+++ b/lua/cmp/utils/window.lua
@@ -133,7 +133,7 @@ end
 ---Update
 window.update = function(self)
   local info = self:info()
-  if info.scrollable then
+  if info.scrollable and self.style.height > 0 then
     -- Draw the background of the scrollbar
 
     if not info.border_info.visible then
diff --git a/lua/cmp/view/custom_entries_view.lua b/lua/cmp/view/custom_entries_view.lua
index dc7564d..9a665b1 100644
--- a/lua/cmp/view/custom_entries_view.lua
+++ b/lua/cmp/view/custom_entries_view.lua
@@ -212,7 +212,14 @@ custom_entries_view.open = function(self, offset, entries)
     border = completion.border,
     zindex = completion.zindex or 1001,
   })
-  -- always set cursor when starting. It will be adjusted on the call to _select
+
+  -- Don't set the cursor if the entries_win:open function fails
+  -- due to the window's width or height being less than 1
+  if self.entries_win.win == nil then
+    return
+  end
+
+  -- Always set cursor when starting. It will be adjusted on the call to _select
   vim.api.nvim_win_set_cursor(self.entries_win.win, { 1, 0 })
   if preselect_index > 0 and config.get().preselect == types.cmp.PreselectMode.Item then
     self:_select(preselect_index, { behavior = types.cmp.SelectBehavior.Select, active = false })