From 7b8d3aca48eef84d9abe02a9c37f41b4c687a9e7 Mon Sep 17 00:00:00 2001
From: Gennadii Kovalev <gennadiy@weird.company>
Date: Tue, 16 Aug 2016 02:30:25 +0200
Subject: [PATCH] caller. prevent fatals with "nil" function argument given.

---
 caller.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/caller.go b/caller.go
index 8e5acef..bb423dd 100644
--- a/caller.go
+++ b/caller.go
@@ -61,6 +61,11 @@ func (c *caller) getArgs() interface{} {
 calls function with given arguments from its representation using reflection
 */
 func (c *caller) callFunc(h *Channel, args interface{}) []reflect.Value {
+	//nil is untyped, so use the default empty value of correct type
+	if args == nil {
+		args = c.getArgs()
+	}
+
 	a := []reflect.Value{reflect.ValueOf(h), reflect.ValueOf(args).Elem()}
 	if !c.ArgsPresent {
 		a = a[0:1]