diff --git a/scwx-qt/source/scwx/qt/manager/timeline_manager.cpp b/scwx-qt/source/scwx/qt/manager/timeline_manager.cpp
index be661cbd..cb744f92 100644
--- a/scwx-qt/source/scwx/qt/manager/timeline_manager.cpp
+++ b/scwx-qt/source/scwx/qt/manager/timeline_manager.cpp
@@ -24,7 +24,11 @@ class TimelineManager::Impl
 public:
    explicit Impl(TimelineManager* self) : self_ {self} {}
 
-   ~Impl() {}
+   ~Impl()
+   {
+      // Lock mutexes before destroying
+      std::unique_lock selectTimeLock {selectTimeMutex_};
+   }
 
    TimelineManager* self_;