diff --git a/src/core/thread.c b/src/core/thread.c
index 3a0c802ea..15dafe185 100644
--- a/src/core/thread.c
+++ b/src/core/thread.c
@@ -623,6 +623,10 @@ static void _mCoreLog(struct mLogger* logger, int category, enum mLogLevel level
 	printf("%s: ", mLogCategoryName(category));
 	vprintf(format, args);
 	printf("\n");
+	struct mCoreThread* thread = mCoreThreadGet();
+	if (thread && level == mLOG_FATAL) {
+		mCoreThreadMarkCrashed(thread);
+	}
 }
 
 struct mLogger* mCoreThreadLogger(void) {
diff --git a/src/gba/bios.c b/src/gba/bios.c
index fba9479ed..6d4835bed 100644
--- a/src/gba/bios.c
+++ b/src/gba/bios.c
@@ -531,7 +531,11 @@ static void _unLz77(struct GBA* gba, int width) {
 				bytes = (block >> 12) + 3;
 				while (bytes--) {
 					if (!remaining) {
-						mLOG(GBA_BIOS, GAME_ERROR, "Improperly compressed LZ77 data. Real BIOS would hang.");
+						if (gba->hardCrash) {
+							mLOG(GBA_BIOS, FATAL, "Improperly compressed LZ77 data. Real BIOS would hang.");
+						} else {
+							mLOG(GBA_BIOS, GAME_ERROR, "Improperly compressed LZ77 data. Real BIOS would hang.");
+						}
 						break;
 					}
 					--remaining;
diff --git a/src/platform/qt/LogController.cpp b/src/platform/qt/LogController.cpp
index d8870d335..32cf7a917 100644
--- a/src/platform/qt/LogController.cpp
+++ b/src/platform/qt/LogController.cpp
@@ -13,7 +13,7 @@ LogController::LogController(int levels, QObject* parent)
 	: QObject(parent)
 {
 	mLogFilterInit(&m_filter);
-	mLogFilterSet(&m_filter, "gba.bios", mLOG_STUB);
+	mLogFilterSet(&m_filter, "gba.bios", mLOG_STUB | mLOG_FATAL);
 	mLogFilterSet(&m_filter, "core.status", mLOG_ALL & ~mLOG_DEBUG);
 	m_filter.defaultLevels = levels;