From a3af44becb83d44e33d1463b89f749a15c83689e Mon Sep 17 00:00:00 2001
From: Ellpeck <megamaximal@gmail.com>
Date: Tue, 19 May 2020 16:06:38 +0200
Subject: [PATCH] Fixed empty coroutines throwing a NRE Closes #3

---
 Coroutine/ActiveCoroutine.cs  | 1 -
 Coroutine/CoroutineHandler.cs | 2 ++
 Test/Example.cs               | 6 ++++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Coroutine/ActiveCoroutine.cs b/Coroutine/ActiveCoroutine.cs
index 03a8812..cd69783 100644
--- a/Coroutine/ActiveCoroutine.cs
+++ b/Coroutine/ActiveCoroutine.cs
@@ -11,7 +11,6 @@ namespace Coroutine {
 
         internal ActiveCoroutine(IEnumerator<IWait> enumerator) {
             this.enumerator = enumerator;
-            this.enumerator.MoveNext();
         }
 
         public bool Cancel() {
diff --git a/Coroutine/CoroutineHandler.cs b/Coroutine/CoroutineHandler.cs
index 43ba3ca..6ca268e 100644
--- a/Coroutine/CoroutineHandler.cs
+++ b/Coroutine/CoroutineHandler.cs
@@ -9,6 +9,8 @@ namespace Coroutine {
         private static readonly List<ActiveCoroutine> EventCoroutines = new List<ActiveCoroutine>();
 
         public static ActiveCoroutine Start(IEnumerator<IWait> coroutine) {
+            if (!coroutine.MoveNext())
+                return null;
             var inst = new ActiveCoroutine(coroutine);
             var type = inst.GetCurrentType();
             if (type == WaitType.Tick)
diff --git a/Test/Example.cs b/Test/Example.cs
index 451f925..75b401c 100644
--- a/Test/Example.cs
+++ b/Test/Example.cs
@@ -12,6 +12,8 @@ namespace Test {
             var seconds = CoroutineHandler.Start(WaitSeconds());
             CoroutineHandler.Start(PrintEvery10Seconds(seconds));
 
+            CoroutineHandler.Start(EmptyCoroutine());
+
             CoroutineHandler.InvokeLater(new WaitSeconds(10), () => {
                 Console.WriteLine("Raising test event");
                 CoroutineHandler.RaiseEvent(TestEvent);
@@ -53,5 +55,9 @@ namespace Test {
             }
         }
 
+        private static IEnumerator<IWait> EmptyCoroutine() {
+            yield break;
+        }
+
     }
 }
\ No newline at end of file