diff --git a/src/gba/gba.c b/src/gba/gba.c
index 3eebc051d..78ffe1c76 100644
--- a/src/gba/gba.c
+++ b/src/gba/gba.c
@@ -425,6 +425,10 @@ void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char
 	gba->pristineRomSize = vf->seek(vf, 0, SEEK_END);
 	vf->seek(vf, 0, SEEK_SET);
 	gba->pristineRom = vf->map(vf, SIZE_CART0, MAP_READ);
+	if (!gba->pristineRom) {
+		GBALog(gba, GBA_LOG_WARN, "Couldn't map ROM");
+		return;
+	}
 	gba->memory.rom = gba->pristineRom;
 	gba->activeFile = fname;
 	gba->memory.romSize = gba->pristineRomSize;
@@ -437,7 +441,12 @@ void GBALoadROM(struct GBA* gba, struct VFile* vf, struct VFile* sav, const char
 
 void GBALoadBIOS(struct GBA* gba, struct VFile* vf) {
 	gba->biosVf = vf;
-	gba->memory.bios = vf->map(vf, SIZE_BIOS, MAP_READ);
+	uint32_t* bios = vf->map(vf, SIZE_BIOS, MAP_READ);
+	if (!bios) {
+		GBALog(gba, GBA_LOG_WARN, "Couldn't map BIOS");
+		return;
+	}
+	gba->memory.bios = bios;
 	gba->memory.fullBios = 1;
 	uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
 	GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);