2 files changed, 7 insertions, 20 deletions
diff --git a/src/nvim/api/tabpage.c b/src/nvim/api/tabpage.c
index 72168d936a..3e5d00671a 100644
--- a/src/nvim/api/tabpage.c
+++ b/src/nvim/api/tabpage.c
@@ -7,6 +7,7 @@
 #include "nvim/api/private/defs.h"
 #include "nvim/api/private/helpers.h"
 #include "nvim/memory.h"
+#include "nvim/window.h"
 
 /// Gets the number of windows in a tabpage
 ///
@@ -18,27 +19,18 @@ ArrayOf(Window) tabpage_get_windows(Tabpage tabpage, Error *err)
   Array rv = ARRAY_DICT_INIT;
   tabpage_T *tab = find_tab_by_handle(tabpage, err);
 
-  if (!tab) {
+  if (!tab || !valid_tabpage(tab)) {
     return rv;
   }
 
-  tabpage_T *tp;
-  win_T *wp;
-
-  FOR_ALL_TAB_WINDOWS(tp, wp) {
-    if (tp != tab) {
-      break;
-    }
+  FOR_ALL_WINDOWS_IN_TAB(wp, tab) {
     rv.size++;
   }
 
   rv.items = xmalloc(sizeof(Object) * rv.size);
   size_t i = 0;
 
-  FOR_ALL_TAB_WINDOWS(tp, wp) {
-    if (tp != tab) {
-      break;
-    }
+  FOR_ALL_WINDOWS_IN_TAB(wp, tab) {
     rv.items[i++] = WINDOW_OBJ(wp->handle);
   }
 
@@ -90,18 +82,15 @@ Window tabpage_get_window(Tabpage tabpage, Error *err)
   Window rv = 0;
   tabpage_T *tab = find_tab_by_handle(tabpage, err);
 
-  if (!tab) {
+  if (!tab || !valid_tabpage(tab)) {
     return rv;
   }
 
   if (tab == curtab) {
     return vim_get_current_window();
   } else {
-    tabpage_T *tp;
-    win_T *wp;
-
-    FOR_ALL_TAB_WINDOWS(tp, wp) {
-      if (tp == tab && wp == tab->tp_curwin) {
+    FOR_ALL_WINDOWS_IN_TAB(wp, tab) {
+      if (wp == tab->tp_curwin) {
         return wp->handle;
       }
     }
diff --git a/src/nvim/api/vim.c b/src/nvim/api/vim.c
index 93aa0439f0..5e0f3e0c32 100644
--- a/src/nvim/api/vim.c
+++ b/src/nvim/api/vim.c
@@ -380,8 +380,6 @@ void vim_set_current_buffer(Buffer buffer, Error *err)
 ArrayOf(Window) vim_get_windows(void)
 {
   Array rv = ARRAY_DICT_INIT;
-  tabpage_T *tp;
-  win_T *wp;
 
   FOR_ALL_TAB_WINDOWS(tp, wp) {
     rv.size++;