From 7f13387487d9650f4212489b86e9a8be4beb2a0f Mon Sep 17 00:00:00 2001
From: Jason C <jason.cipriani@gmail.com>
Date: Wed, 5 May 2021 17:30:29 -0400
Subject: [PATCH] [cob] Fix assertion failure when file could not be opened.

Check result of IOSystem::Open before constructing stream.

Partially addresses #3888.
---
 code/AssetLib/COB/COBLoader.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/code/AssetLib/COB/COBLoader.cpp b/code/AssetLib/COB/COBLoader.cpp
index efe7fc446..a6e9d4218 100644
--- a/code/AssetLib/COB/COBLoader.cpp
+++ b/code/AssetLib/COB/COBLoader.cpp
@@ -137,7 +137,13 @@ void COBImporter::SetupProperties(const Importer * /*pImp*/) {
 // Imports the given file into the given scene structure.
 void COBImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) {
     COB::Scene scene;
-    std::unique_ptr<StreamReaderLE> stream(new StreamReaderLE(pIOHandler->Open(pFile, "rb")));
+
+    auto file = pIOHandler->Open(pFile, "rb");
+    if (!file) {
+        ThrowException("Could not open " + pFile);
+    }
+
+    std::unique_ptr<StreamReaderLE> stream(new StreamReaderLE(file));
 
     // check header
     char head[32];