https://bugs.gentoo.org/784071
https://git.suckless.org/st/commit/2f6e597ed871cff91c627850d03152cae5f45779.html
--- a/x.c
+++ b/x.c
@@ -1585,8 +1585,9 @@ xsettitle(char *p)
 	XTextProperty prop;
 	DEFAULT(p, opt_title);
 
-	Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
-			&prop);
+	if (Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
+			&prop) != Success)
+		return;
 	XSetWMName(xw.dpy, xw.win, &prop);
 	XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
 	XFree(prop.value);