diff --git a/src-interface/processing.cpp b/src-interface/processing.cpp
index e8b228401..f163eec7f 100644
--- a/src-interface/processing.cpp
+++ b/src-interface/processing.cpp
@@ -36,6 +36,10 @@ namespace satdump
             // Get pipeline
             std::optional<Pipeline> pipeline = getPipelineFromName(downlink_pipeline);
 
+            ui_call_list_mutex->lock();
+            ui_call_list->clear();
+            ui_call_list_mutex->unlock();
+
             if (pipeline.has_value())
             {
                 try
@@ -47,6 +51,7 @@ namespace satdump
                     logger->error("Fatal error running pipeline : " + std::string(e.what()));
                     error::set_error("Pipeline Error", e.what());
                     is_processing = false;
+                    processing_mutex.unlock();
                     return;
                 }
             }
@@ -65,6 +70,7 @@ namespace satdump
                     viewer_app->loadDatasetInViewer(output_file + "/dataset.json");
                 }
             }
+
             processing_mutex.unlock();
         }