diff --git a/cores/esp32/esp32-hal-uart.c b/cores/esp32/esp32-hal-uart.c
index 02999993..3f79f22a 100644
--- a/cores/esp32/esp32-hal-uart.c
+++ b/cores/esp32/esp32-hal-uart.c
@@ -226,6 +226,7 @@ void uartEnd(uart_t* uart)
         uint8_t c;
         while(xQueueReceive(uart->queue, &c, 0));
         vQueueDelete(uart->queue);
+        uart->queue = NULL;
     }
 
     uart->dev->conf0.val = 0;