diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/CompilerServices/AsyncUniTaskMethodBuilder.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/CompilerServices/AsyncUniTaskMethodBuilder.cs
index 1aa990d..cb7c09c 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/CompilerServices/AsyncUniTaskMethodBuilder.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/CompilerServices/AsyncUniTaskMethodBuilder.cs
@@ -1,4 +1,3 @@
-
 #pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
 
 using System;
@@ -56,7 +55,10 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             }
             else
             {
-                runnerPromise.SetException(exception);
+                if (runnerPromise != null)
+                {
+                    runnerPromise.SetException(exception);
+                }
             }
         }
 
@@ -83,7 +85,10 @@ namespace Cysharp.Threading.Tasks.CompilerServices
                 AsyncUniTask<TStateMachine>.SetStateMachine(ref stateMachine, ref runnerPromise);
             }
 
-            awaiter.OnCompleted(runnerPromise.MoveNext);
+            if (runnerPromise != null)
+            {
+                awaiter.OnCompleted(runnerPromise.MoveNext);
+            }
         }
 
         // 6. AwaitUnsafeOnCompleted
@@ -99,7 +104,10 @@ namespace Cysharp.Threading.Tasks.CompilerServices
                 AsyncUniTask<TStateMachine>.SetStateMachine(ref stateMachine, ref runnerPromise);
             }
 
-            awaiter.UnsafeOnCompleted(runnerPromise.MoveNext);
+            if (runnerPromise != null)
+            {
+                awaiter.UnsafeOnCompleted(runnerPromise.MoveNext);
+            }
         }
 
         // 7. Start
@@ -183,7 +191,10 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             }
             else
             {
-                runnerPromise.SetException(exception);
+                if (runnerPromise != null)
+                {
+                    runnerPromise.SetException(exception);
+                }
             }
         }
 
@@ -198,7 +209,10 @@ namespace Cysharp.Threading.Tasks.CompilerServices
             }
             else
             {
-                runnerPromise.SetResult(result);
+                if (runnerPromise != null)
+                {
+                    runnerPromise.SetResult(result);
+                }
             }
         }
 
@@ -214,7 +228,10 @@ namespace Cysharp.Threading.Tasks.CompilerServices
                 AsyncUniTask<TStateMachine, T>.SetStateMachine(ref stateMachine, ref runnerPromise);
             }
 
-            awaiter.OnCompleted(runnerPromise.MoveNext);
+            if (runnerPromise != null)
+            {
+                awaiter.OnCompleted(runnerPromise.MoveNext);
+            }
         }
 
         // 6. AwaitUnsafeOnCompleted
@@ -230,7 +247,10 @@ namespace Cysharp.Threading.Tasks.CompilerServices
                 AsyncUniTask<TStateMachine, T>.SetStateMachine(ref stateMachine, ref runnerPromise);
             }
 
-            awaiter.UnsafeOnCompleted(runnerPromise.MoveNext);
+            if (runnerPromise != null)
+            {
+                awaiter.UnsafeOnCompleted(runnerPromise.MoveNext);
+            }
         }
 
         // 7. Start
@@ -266,4 +286,4 @@ namespace Cysharp.Threading.Tasks.CompilerServices
 #endif
 
     }
-}
\ No newline at end of file
+}
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/PlayerLoopRunner.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/PlayerLoopRunner.cs
index 43625ab..3898598 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/PlayerLoopRunner.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Internal/PlayerLoopRunner.cs
@@ -1,4 +1,3 @@
-
 using System;
 using UnityEngine;
 
@@ -18,8 +17,6 @@ namespace Cysharp.Threading.Tasks.Internal
         IPlayerLoopItem[] loopItems = new IPlayerLoopItem[InitialSize];
         MinimumQueue<IPlayerLoopItem> waitQueue = new MinimumQueue<IPlayerLoopItem>(InitialSize);
 
-
-
         public PlayerLoopRunner(PlayerLoopTiming timing)
         {
             this.unhandledExceptionCallback = ex => Debug.LogException(ex);
@@ -240,6 +237,14 @@ namespace Cysharp.Threading.Tasks.Internal
                     continue;
                 }
 
+                // Reinitialize references after resuming
+                for (int i = 0; i < loopItems.Length; i++)
+                {
+                    if (loopItems[i] == null)
+                    {
+                        loopItems[i] = waitQueue.Dequeue();
+                    }
+                }
 
                 lock (runningAndQueueLock)
                 {
@@ -257,4 +262,3 @@ namespace Cysharp.Threading.Tasks.Internal
         }
     }
 }
-
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/PlayerLoopHelper.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/PlayerLoopHelper.cs
index b17375e..fff1b09 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/PlayerLoopHelper.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/PlayerLoopHelper.cs
@@ -497,6 +497,12 @@ namespace Cysharp.Threading.Tasks
                 ThrowInvalidLoopTiming(timing);
             }
             runner.AddAction(action);
+
+            // Ensure references are not lost after resuming
+            if (action == null)
+            {
+                throw new ArgumentNullException(nameof(action));
+            }
         }
 
         static void ThrowInvalidLoopTiming(PlayerLoopTiming playerLoopTiming)
@@ -512,6 +518,12 @@ namespace Cysharp.Threading.Tasks
                 ThrowInvalidLoopTiming(timing);
             }
             q.Enqueue(continuation);
+
+            // Ensure references are not lost after resuming
+            if (continuation == null)
+            {
+                throw new ArgumentNullException(nameof(continuation));
+            }
         }
 
         // Diagnostics helper
@@ -578,4 +590,3 @@ namespace Cysharp.Threading.Tasks
 
     }
 }
-