diff --git a/stimBuffApis/livoxGen1/ioUringAssemblyEngine.cpp b/stimBuffApis/livoxGen1/ioUringAssemblyEngine.cpp
index 95791ed..e2ba7a0 100644
--- a/stimBuffApis/livoxGen1/ioUringAssemblyEngine.cpp
+++ b/stimBuffApis/livoxGen1/ioUringAssemblyEngine.cpp
@@ -418,6 +418,11 @@ public:
 	timerFired(false), handlerExecuted(false)
 	{}
 
+	void callOriginalCallback(bool success, AsynchronousLoop loop)
+	{
+		callOriginalCb(success, loop);
+	}
+
 public:
 	void assembleFrameReq1_posted(
 		std::shared_ptr<AssembleFrameReq> context)
@@ -488,6 +493,13 @@ public:
 		std::shared_ptr<AssembleFrameReq> context,
 		void *user_data, int cqe_result)
 	{
+		if (!context->engine.isAssembling)
+		{
+			context->loop.setRemainingIterationsToFailure();
+			context->callOriginalCallback(false, context->loop);
+			return;
+		}
+
 		// Extract index from user_data and mark slot as assembled if successful
 		size_t index = reinterpret_cast<size_t>(user_data);
 		bool success = (cqe_result >= 0);
@@ -578,11 +590,6 @@ public:
 		return;
 	}
 
-	void callOriginalCallback(bool success, AsynchronousLoop loop)
-	{
-		callOriginalCb(success, loop);
-	}
-
 public:
 	IoUringAssemblyEngine& engine;
 	AsynchronousLoop loop;