From 7c37a1ef63fa61406cc7a96f2973e7eedb11570f Mon Sep 17 00:00:00 2001
From: Vikram Rangnekar <vicram@gmail.com>
Date: Sun, 21 Apr 2019 01:08:51 -0400
Subject: [PATCH] Fix null pointer with invalid argument values

---
 qcode/qcode.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/qcode/qcode.go b/qcode/qcode.go
index 2308d05..c9095ea 100644
--- a/qcode/qcode.go
+++ b/qcode/qcode.go
@@ -423,6 +423,10 @@ func (com *Compiler) compileArgNode(val *Node) (*Exp, error) {
 	st := util.NewStack()
 	var root *Exp
 
+	if val == nil || len(val.Children) == 0 {
+		return nil, errors.New("invalid argument value")
+	}
+
 	st.Push(&expT{nil, val.Children[0]})
 
 	for {