https://github.com/vim-jp/issues/issues/948

fix-screen_valid.patch

diff --git a/src/move.c b/src/move.c
index a4d5f82..c24c74f 100644
--- a/src/move.c
+++ b/src/move.c
@@ -177,7 +177,7 @@ update_topline(void)
     int		save_so = p_so;
 #endif
 
-    if (!screen_valid(TRUE))
+    if (!screen_valid(TRUE) || !termcap_active)
 	return;
 
     /* If the window height is zero just use the cursor line. */
diff --git a/src/screen.c b/src/screen.c
index 5ebca09..26af008 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -504,7 +504,7 @@ update_screen(int type)
 #endif
 
     /* Don't do anything if the screen structures are (not yet) valid. */
-    if (!screen_valid(TRUE))
+    if (!screen_valid(TRUE) || !termcap_active)
 	return;
 
     if (must_redraw)
@@ -824,7 +824,7 @@ update_single_line(win_T *wp, linenr_T lnum)
     int		j;
 
     /* Don't do anything if the screen structures are (not yet) valid. */
-    if (!screen_valid(TRUE))
+    if (!screen_valid(TRUE) || !termcap_active)
 	return;
 
     if (lnum >= wp->w_topline && lnum < wp->w_botline