patch 7.4.1592
Problem:    Quickfix code using memory after being freed. (Dominique Pelle)
Solution:   Detect that the window was closed. (Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index f2e7d67..409a9f4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1592,
+/**/
     1591,
 /**/
     1590,