diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index 3ddce71d3..4e8504922 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -284,6 +284,7 @@ public:
 	std::vector<std::unique_ptr<FrameBuffer>> conversionBuffers_;
 	std::queue<std::map<const Stream *, FrameBuffer *>> conversionQueue_;
 	bool useConversion_;
+	void clearIncompleteRequests();
 
 	std::unique_ptr<Converter> converter_;
 	std::unique_ptr<SoftwareIsp> swIsp_;
@@ -897,6 +898,19 @@ void SimpleCameraData::conversionOutputDone(FrameBuffer *buffer)
 		pipe->completeRequest(request);
 }
 
+void SimpleCameraData::clearIncompleteRequests()
+{
+	while (!conversionQueue_.empty()) {
+		for (auto &item : conversionQueue_.front()) {
+			FrameBuffer *outputBuffer = item.second;
+			Request *request = outputBuffer->request();
+			pipe()->completeBuffer(request, outputBuffer);
+			pipe()->completeRequest(request);
+		}
+		conversionQueue_.pop();
+	}
+}
+
 void SimpleCameraData::ispStatsReady(uint32_t frame, uint32_t bufferId)
 {
 	swIsp_->processStats(frame, bufferId,
@@ -1407,6 +1421,7 @@ void SimplePipelineHandler::stopDevice(Camera *camera)
 	video->bufferReady.disconnect(data, &SimpleCameraData::bufferReady);
 
 	data->conversionBuffers_.clear();
+	data->clearIncompleteRequests();
 
 	releasePipeline(data);
 }