updated for version 7.4.251
Problem:    Crash when BufAdd autocommand wipes out the buffer.
Solution:   Check for buffer to still be valid. Postpone freeing the buffer
            structure. (Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index ad38a7d..b74ea98 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    251,
+/**/
     250,
 /**/
     249,