diff --git a/CHANGES b/CHANGES
index 94459b0c1..4607a27b8 100644
--- a/CHANGES
+++ b/CHANGES
@@ -35,6 +35,7 @@ Bugfixes:
  - SDL: Fix race condition with audio thread when starting
  - GB: Fix flickering when screen is strobed quickly
  - FFmpeg: Fix overflow and general issues with audio encoding
+ - Qt: Fix crash when changing audio settings after a game is closed
 Misc:
  - SDL: Remove scancode key input
  - GBA Video: Clean up unused timers
diff --git a/src/platform/qt/GameController.cpp b/src/platform/qt/GameController.cpp
index bf81defd0..6c73d06e8 100644
--- a/src/platform/qt/GameController.cpp
+++ b/src/platform/qt/GameController.cpp
@@ -654,6 +654,7 @@ void GameController::cleanGame() {
 	delete[] m_frontBuffer;
 
 	m_threadContext.core->deinit(m_threadContext.core);
+	m_threadContext.core = nullptr;
 	m_gameOpen = false;
 }
 
@@ -1222,7 +1223,7 @@ void GameController::updateKeys() {
 }
 
 void GameController::redoSamples(int samples) {
-	if (m_threadContext.core) {
+	if (m_gameOpen && m_threadContext.core) {
 		m_threadContext.core->setAudioBufferSize(m_threadContext.core, samples);
 	}
 	m_audioProcessor->inputParametersChanged();