1 files changed, 9 insertions, 7 deletions
diff --git a/src/progs/ingenuity/App.cpp b/src/progs/ingenuity/App.cpp
index e1e4912d..8ffcd710 100644
--- a/src/progs/ingenuity/App.cpp
+++ b/src/progs/ingenuity/App.cpp
@@ -120,13 +120,15 @@ App::attach(const SharedPtr<ModelEngineInterface>& engine, const SharedPtr<SigCl
 void
 App::detach()
 {
-	_window_factory->clear();
-	_store->clear();
-	
-	_loader.reset();
-	_store.reset();
-	_client.reset();
-	_engine.reset();
+	if (_engine) {
+		_window_factory->clear();
+		_store->clear();
+
+		_loader.reset();
+		_store.reset();
+		_client.reset();
+		_engine.reset();
+	}
 }