diff --git a/Core/display.c b/Core/display.c
index 356e742..67a9fc4 100644
--- a/Core/display.c
+++ b/Core/display.c
@@ -165,7 +165,7 @@ static void display_vblank(GB_gameboy_t *gb)
                 0x30DA, 0x69AD, 0x2B57, 0x2B5D, 0x632C,
                 0x1050, 0x3C84, 0x0E07, 0x0E18, 0x2964,
             };
-            unsigned index = gb->rom[0x14e] % 5;
+            unsigned index = gb->rom? gb->rom[0x14e] % 5 : 0;
             gb->borrowed_border.palette[0] = colors[index];
             gb->borrowed_border.palette[10] = colors[5 + index];
             gb->borrowed_border.palette[14] = colors[10 + index];
diff --git a/Core/gb.c b/Core/gb.c
index 75538e1..3b834dd 100644
--- a/Core/gb.c
+++ b/Core/gb.c
@@ -230,7 +230,7 @@ void GB_borrow_sgb_border(GB_gameboy_t *gb)
     if (gb->border_mode != GB_BORDER_ALWAYS) return;
     if (gb->tried_loading_sgb_border) return;
     gb->tried_loading_sgb_border = true;
-    if (gb->rom[0x146] != 3) return; // Not an SGB game, nothing to borrow
+    if (gb->rom && gb->rom[0x146] != 3) return; // Not an SGB game, nothing to borrow
     if (!gb->boot_rom_load_callback) return; // Can't borrow a border without this callback
     GB_gameboy_t sgb;
     GB_init(&sgb, GB_MODEL_SGB);