patch 7.4.1826
Problem:    Callbacks are invoked when it's not safe. (Andrew Stewart)
Solution:   When a channel is to be closed don't invoke callbacks right away,
            wait for a safe moment.
diff --git a/src/version.c b/src/version.c
index a6f85c3..373aff2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1826,
+/**/
     1825,
 /**/
     1824,