patch 7.4.1664
Problem:    Crash in :cgetexpr.
Solution:   Check for NULL pointer. (Dominique) Add a test.
diff --git a/src/version.c b/src/version.c
index f21fb6b..e925e41 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1664,
+/**/
     1663,
 /**/
     1662,