From 8d9deb813835917188df8508a20318ad78fd76de Mon Sep 17 00:00:00 2001
From: RadWolfie <RadWolfie@users.noreply.github.com>
Date: Wed, 7 Apr 2021 18:03:02 -0500
Subject: [PATCH] ImGui: couple fixes for different cause of crashes

---
 src/core/common/video/RenderBase.hpp | 8 ++++++--
 src/core/kernel/init/CxbxKrnl.cpp    | 7 ++++---
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/core/common/video/RenderBase.hpp b/src/core/common/video/RenderBase.hpp
index a1428adbc..1a2485a14 100644
--- a/src/core/common/video/RenderBase.hpp
+++ b/src/core/common/video/RenderBase.hpp
@@ -31,7 +31,9 @@ public:
 	}
 
 	void DeviceRelease() {
-		m_device_release();
+		if (m_device_release) {
+			m_device_release();
+		}
 	}
 
 	void SetWindowRelease(const std::function<void()>& func_register) {
@@ -39,7 +41,9 @@ public:
 	}
 
 	void WindowRelease() {
-		m_window_release();
+		if (m_window_release) {
+			m_window_release();
+		}
 	}
 
 protected:
diff --git a/src/core/kernel/init/CxbxKrnl.cpp b/src/core/kernel/init/CxbxKrnl.cpp
index dc63a90ac..72fcd012e 100644
--- a/src/core/kernel/init/CxbxKrnl.cpp
+++ b/src/core/kernel/init/CxbxKrnl.cpp
@@ -1783,9 +1783,10 @@ void CxbxKrnlShutDown(bool is_reboot)
 	g_VMManager.Shutdown();
 
 	// Shutdown the render manager
-	g_renderbase->Shutdown();
-	g_renderbase.release();
-	g_renderbase = nullptr;
+	if (g_renderbase != nullptr) {
+		g_renderbase->Shutdown();
+		g_renderbase = nullptr;
+	}
 
 	CxbxUnlockFilePath();