updated for version 7.3.904
Problem: Using memory freed by the garbage collector.
Solution: Mark items in aucmd_win as used.
diff --git a/src/eval.c b/src/eval.c
index 866b40c..4bfc041 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -6792,6 +6792,10 @@
/* window-local variables */
FOR_ALL_TAB_WINDOWS(tp, wp)
set_ref_in_item(&wp->w_winvar.di_tv, copyID);
+#ifdef FEAT_AUTOCMD
+ if (aucmd_win != NULL)
+ set_ref_in_item(&aucmd_win->w_winvar.di_tv, copyID);
+#endif
#ifdef FEAT_WINDOWS
/* tabpage-local variables */