From 106960cbb5509705535ee0b87482405cdd8fa700 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Fri, 4 Jan 2019 23:06:37 -0800
Subject: [PATCH] Check for null help URL

---
 mist/mist.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mist/mist.cpp b/mist/mist.cpp
index 31f30e3..956bd5c 100644
--- a/mist/mist.cpp
+++ b/mist/mist.cpp
@@ -56,6 +56,10 @@ VOID CALLBACK MsgBoxHelpCallback(LPHELPINFO lpHelpInfo)
 {
     const char* helpUrl = (const char*)lpHelpInfo->dwContextId;
 
+    if (!helpUrl) {
+        return;
+    }
+
     // It's recommended to initialize COM before calling ShellExecute()
     CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
     ShellExecuteA(nullptr, "open", helpUrl, nullptr, nullptr, SW_SHOWNORMAL);