diff --git a/gnu/lib/libdialog/checklist.c b/gnu/lib/libdialog/checklist.c
index f802f33505c5..cc83d258b5ff 100644
--- a/gnu/lib/libdialog/checklist.c
+++ b/gnu/lib/libdialog/checklist.c
@@ -59,6 +59,11 @@ int dialog_checklist(unsigned char *title, unsigned char *prompt, int height, in
     draw_shadow(stdscr, y, x, height, width);
 #endif
   dialog = newwin(height, width, y, x);
+  if (dialog == NULL) {
+    endwin();
+    fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
+    exit(1);
+  }
   keypad(dialog, TRUE);
 
   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
@@ -91,6 +96,11 @@ int dialog_checklist(unsigned char *title, unsigned char *prompt, int height, in
 
   /* create new window for the list */
   list = subwin(dialog, list_height, list_width, y + box_y + 1, x + box_x + 1);
+  if (list == NULL) {
+    endwin();
+    fprintf(stderr, "\nsubwin(dialog,%d,%d,%d,%d) failed, maybe wrong dims\n", list_height,list_width,y+box_y+1,x+box_x+1);
+    exit(1);
+  }
   keypad(list, TRUE);
 
   /* draw a box around the list items */
diff --git a/gnu/lib/libdialog/inputbox.c b/gnu/lib/libdialog/inputbox.c
index bf423c9c8261..8bf384dcf9e8 100644
--- a/gnu/lib/libdialog/inputbox.c
+++ b/gnu/lib/libdialog/inputbox.c
@@ -42,6 +42,11 @@ int dialog_inputbox(unsigned char *title, unsigned char *prompt, int height, int
     draw_shadow(stdscr, y, x, height, width);
 #endif
   dialog = newwin(height, width, y, x);
+  if (dialog == NULL) {
+    endwin();
+    fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
+    exit(1);
+  }
   keypad(dialog, TRUE);
 
   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
diff --git a/gnu/lib/libdialog/menubox.c b/gnu/lib/libdialog/menubox.c
index 332dfa75c15c..5aa5b5b11168 100644
--- a/gnu/lib/libdialog/menubox.c
+++ b/gnu/lib/libdialog/menubox.c
@@ -49,6 +49,11 @@ int dialog_menu(unsigned char *title, unsigned char *prompt, int height, int wid
     draw_shadow(stdscr, y, x, height, width);
 #endif
   dialog = newwin(height, width, y, x);
+  if (dialog == NULL) {
+    endwin();
+    fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
+    exit(1);
+  }
   keypad(dialog, TRUE);
 
   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
@@ -81,6 +86,11 @@ int dialog_menu(unsigned char *title, unsigned char *prompt, int height, int wid
 
   /* create new window for the menu */
   menu = subwin(dialog, menu_height, menu_width, y + box_y + 1, x + box_x + 1);
+  if (menu == NULL) {
+    endwin();
+    fprintf(stderr, "\nsubwin(dialog,%d,%d,%d,%d) failed, maybe wrong dims\n", menu_height,menu_width,y+box_y+1,x+box_x+1);
+    exit(1);
+  }
   keypad(menu, TRUE);
 
   /* draw a box around the menu items */
diff --git a/gnu/lib/libdialog/msgbox.c b/gnu/lib/libdialog/msgbox.c
index c56b58b41c8d..e405f3b5a26a 100644
--- a/gnu/lib/libdialog/msgbox.c
+++ b/gnu/lib/libdialog/msgbox.c
@@ -41,6 +41,11 @@ int dialog_msgbox(unsigned char *title, unsigned char *prompt, int height, int w
     draw_shadow(stdscr, y, x, height, width);
 #endif
   dialog = newwin(height, width, y, x);
+  if (dialog == NULL) {
+    endwin();
+    fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
+    exit(1);
+  }
   keypad(dialog, TRUE);
 
   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
diff --git a/gnu/lib/libdialog/prgbox.c b/gnu/lib/libdialog/prgbox.c
index d95ffdb1b04c..db825890a301 100644
--- a/gnu/lib/libdialog/prgbox.c
+++ b/gnu/lib/libdialog/prgbox.c
@@ -43,6 +43,11 @@ int dialog_prgbox(unsigned char *title, const char *line, int height, int width,
     draw_shadow(stdscr, y, x, height, width);
 #endif
   dialog = newwin(height, width, y, x);
+  if (dialog == NULL) {
+    endwin();
+    fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
+    exit(1);
+  }
   keypad(dialog, TRUE);
 
   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
diff --git a/gnu/lib/libdialog/radiolist.c b/gnu/lib/libdialog/radiolist.c
index 3618e6867d4c..5a2151861d87 100644
--- a/gnu/lib/libdialog/radiolist.c
+++ b/gnu/lib/libdialog/radiolist.c
@@ -67,6 +67,11 @@ int dialog_radiolist(char *title, char *prompt, int height, int width, int list_
     draw_shadow(stdscr, y, x, height, width);
 #endif
   dialog = newwin(height, width, y, x);
+  if (dialog == NULL) {
+    endwin();
+    fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
+    exit(1);
+  }
   keypad(dialog, TRUE);
 
   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
@@ -99,6 +104,11 @@ int dialog_radiolist(char *title, char *prompt, int height, int width, int list_
 
   /* create new window for the list */
   list = subwin(dialog, list_height, list_width, y + box_y + 1, x + box_x + 1);
+  if (list == NULL) {
+    endwin();
+    fprintf(stderr, "\nsubwin(dialog,%d,%d,%d,%d) failed, maybe wrong dims\n", list_height,list_width,y+box_y+1,x+box_x+1);
+    exit(1);
+  }
   keypad(list, TRUE);
 
   /* draw a box around the list items */
diff --git a/gnu/lib/libdialog/textbox.c b/gnu/lib/libdialog/textbox.c
index cb874743b6a7..670ea49fe32c 100644
--- a/gnu/lib/libdialog/textbox.c
+++ b/gnu/lib/libdialog/textbox.c
@@ -92,11 +92,21 @@ int dialog_textbox(unsigned char *title, unsigned char *file, int height, int wi
     draw_shadow(stdscr, y, x, height, width);
 #endif
   dialog = newwin(height, width, y, x);
+  if (dialog == NULL) {
+    endwin();
+    fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
+    exit(1);
+  }
   keypad(dialog, TRUE);
 
   /* Create window for text region, used for scrolling text */
 /*  text = newwin(height-4, width-2, y+1, x+1); */
   text = subwin(dialog, height-4, width-2, y+1, x+1);
+  if (text == NULL) {
+    endwin();
+    fprintf(stderr, "\nsubwin(dialog,%d,%d,%d,%d) failed, maybe wrong dims\n", height-4,width-2,y+1,x+1);
+    exit(1);
+  }
   keypad(text, TRUE);
 
   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
diff --git a/gnu/lib/libdialog/yesno.c b/gnu/lib/libdialog/yesno.c
index c97d80062931..3f21b5a7d585 100644
--- a/gnu/lib/libdialog/yesno.c
+++ b/gnu/lib/libdialog/yesno.c
@@ -40,6 +40,11 @@ int dialog_yesno(unsigned char *title, unsigned char * prompt, int height, int w
     draw_shadow(stdscr, y, x, height, width);
 #endif
   dialog = newwin(height, width, y, x);
+  if (dialog == NULL) {
+    endwin();
+    fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height,width,y,x);
+    exit(1);
+  }
   keypad(dialog, TRUE);
 
   draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);