diff --git a/rtl837x_flash.c b/rtl837x_flash.c
index 5f04c88a..2ec5bc3f 100644
--- a/rtl837x_flash.c
+++ b/rtl837x_flash.c
@@ -221,7 +221,9 @@ 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();
@@ -258,6 +260,9 @@ void flash_read_bulk(__xdata uint8_t *dst)
 
 void flash_read_security(void)
 {
+	if (!flash_region.len)
+		return;
+
 	flash_configure_sio();
 
 	while (flash_read_status() & STATUS_REG_BUSY_MASK);