patch 9.0.1911: Vim9: segfault with null object and instanceof()

Problem:  Vim9: segfault with null object and instanceof()
Solution: return early

closes: #13121

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Ernie Rael <errael@raelity.com>
diff --git a/src/version.c b/src/version.c
index c2bef2f..79b1e11 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1911,
+/**/
     1910,
 /**/
     1909,