From f9c60a226a0631a7ec74bf5997aa22ba8e82495c Mon Sep 17 00:00:00 2001
From: hreintke <hreintke@tauri.nl>
Date: Sun, 31 Dec 2017 07:53:42 +0100
Subject: [PATCH] Prevent endless loop in run_scheduled_functions (#4048)

---
 cores/esp8266/Schedule.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/cores/esp8266/Schedule.cpp b/cores/esp8266/Schedule.cpp
index 6fabd942a..27b973195 100644
--- a/cores/esp8266/Schedule.cpp
+++ b/cores/esp8266/Schedule.cpp
@@ -65,12 +65,12 @@ bool schedule_function(std::function<void(void)> fn)
 
 void run_scheduled_functions()
 {
-    while (sFirst) {
-        scheduled_fn_t* item = sFirst;
-        sFirst = item->mNext;
-        if (sFirst == NULL) {
-            sLast = NULL;
-        }
+	scheduled_fn_t* rFirst = sFirst;
+	sFirst = NULL;
+	sLast  = NULL;
+    while (rFirst) {
+        scheduled_fn_t* item = rFirst;
+        rFirst = item->mNext;
         item->mFunc();
         item->mFunc = std::function<void(void)>();
         recycle_fn(item);