diff --git a/qrenderdoc/Code/pyrenderdoc/PythonContext.cpp b/qrenderdoc/Code/pyrenderdoc/PythonContext.cpp
index 779b2506b..e5bb50571 100644
--- a/qrenderdoc/Code/pyrenderdoc/PythonContext.cpp
+++ b/qrenderdoc/Code/pyrenderdoc/PythonContext.cpp
@@ -722,7 +722,8 @@ void PythonContext::outstream_del(PyObject *self)
   {
     PythonContext *context = redirector->context;
 
-    delete context;
+    // delete the context on the UI thread.
+    GUIInvoke::call([context]() { delete context; });
   }
 }