diff --git a/rtl837x_flash.c b/rtl837x_flash.c
index 5f04c88a..f18d21fb 100644
--- a/rtl837x_flash.c
+++ b/rtl837x_flash.c
@@ -222,6 +222,10 @@ void flash_read_jedecid(void)
 void flash_read_bulk(__xdata uint8_t *dst)
 {
 	short status;
+
+	if (!flash_region.len)
+		return;
+
 	flash_configure_sio();
 	while (flash_read_status() & STATUS_REG_BUSY_MASK);
 	flash_configure_mmio();