--- ncurses/base/wresize.c.ORIG	2020-04-15 14:37:15.090975219 +0200
+++ ncurses/base/wresize.c	2020-04-15 15:25:29.780981403 +0200
@@ -175,11 +175,12 @@
 		    s = typeMalloc(NCURSES_CH_T, (unsigned) ToCols + 1);
 		    if (s == 0)
 			returnCode(cleanup_lines(new_lines, row));
-		    for (col = 0; col <= ToCols; ++col) {
+		    for (col = 0; col < ToCols; ++col) {
 			s[col] = (col <= size_x
 				  ? win->_line[row].text[col]
 				  : win->_nc_bkgd);
 		    }
+		    s[ToCols] = win->_nc_bkgd;
 		} else {
 		    s = win->_line[row].text;
 		}