From 400038643cab557e828881c716d0f08820accd69 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <c.oelckers@zdoom.fake>
Date: Sat, 26 Dec 2015 15:31:59 +0100
Subject: [PATCH] - fixed: Strife dialogues could crash on invalid links.

---
 src/p_conversation.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/p_conversation.cpp b/src/p_conversation.cpp
index 069fca6e1..85edc53ab 100644
--- a/src/p_conversation.cpp
+++ b/src/p_conversation.cpp
@@ -1347,9 +1347,10 @@ static void HandleReply(player_t *player, bool isconsole, int nodenum, int reply
 		int rootnode = npc->ConversationRoot;
 		if (reply->NextNode < 0)
 		{
-			npc->Conversation = StrifeDialogues[rootnode - reply->NextNode - 1];
-			if (gameaction != ga_slideshow)
+			unsigned next = (unsigned)(rootnode - reply->NextNode - 1);
+			if (gameaction != ga_slideshow && next < StrifeDialogues.Size())
 			{
+				npc->Conversation = StrifeDialogues[next];
 				P_StartConversation (npc, player->mo, player->ConversationFaceTalker, false);
 				return;
 			}