diff --git a/app/render/previewautocacher.cpp b/app/render/previewautocacher.cpp
index f697a6aca..9ea8439cb 100644
--- a/app/render/previewautocacher.cpp
+++ b/app/render/previewautocacher.cpp
@@ -739,12 +739,14 @@ void PreviewAutoCacher::SetViewerNode(ViewerOutput *viewer_node)
     if (!video_tasks_.isEmpty()) {
       // Cancel any video tasks and wait for them to finish
       CancelVideoTasks(true);
+      video_tasks_.clear();
     }
 
     // Handle audio rendering tasks
     if (!audio_tasks_.isEmpty()) {
       // Cancel any audio tasks and wait for them to finish
       CancelAudioTasks(true);
+      audio_tasks_.clear();
     }
 
     // Clear iterators