From 77b03472c6ce1a22ffd4ec456c3962b22a574593 Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Thu, 17 Aug 2017 19:04:20 +0300
Subject: [PATCH] Set uart queue to NULL after free

Fixes: https://github.com/espressif/arduino-esp32/issues/435
---
 cores/esp32/esp32-hal-uart.c | 1 +
 1 file changed, 1 insertion(+)

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;