From a44c6692936195ab08293bc5beb9ac50ad76ef8d Mon Sep 17 00:00:00 2001
From: David Gauchard <gauchard@laas.fr>
Date: Mon, 2 Jul 2018 22:53:13 +0200
Subject: [PATCH] fix scheduled interrupt #4609 by @shimarin
---
cores/esp8266/core_esp8266_wiring_digital.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/cores/esp8266/core_esp8266_wiring_digital.c b/cores/esp8266/core_esp8266_wiring_digital.c
index 68b8055f00..12834a18b6 100644
--- a/cores/esp8266/core_esp8266_wiring_digital.c
+++ b/cores/esp8266/core_esp8266_wiring_digital.c
@@ -147,7 +147,7 @@ void ICACHE_RAM_ATTR interrupt_handler(void *arg) {
// we disable them before we call the client ISR
uint32_t savedPS = xt_rsil(15); // stop other interrupts
ArgStructure* localArg = (ArgStructure*)handler->arg;
- if (localArg->interruptInfo)
+ if (localArg && localArg->interruptInfo)
{
localArg->interruptInfo->pin = i;
localArg->interruptInfo->value = __digitalRead(i);