diff --git a/assets/webui/ofdgo_host.js b/assets/webui/ofdgo_host.js
index b54a7de..cb30bfa 100644
--- a/assets/webui/ofdgo_host.js
+++ b/assets/webui/ofdgo_host.js
@@ -168,7 +168,8 @@ class NativeHost {
 						const cancel = () => host.call("engine.cancel", {engine, id:data.id}).catch(() => {});
 						controller.signal.addEventListener("abort", cancel, {once:true});
 						try {
-							await host.call("engine.start", args, controller.signal);
+							await host.call("engine.start", args);
+							if (controller.signal.aborted) cancel();
 							result = await completed;
 							await host.call("engine.finish", {engine, id:data.id});
 						} finally {
diff --git a/internal/webview/webview.go b/internal/webview/webview.go
index e998558..82cfbdd 100644
--- a/internal/webview/webview.go
+++ b/internal/webview/webview.go
@@ -775,6 +775,8 @@ func (h *Host) close() {
 		cancel()
 	}
 	engines := h.engines
+	results := h.batchResults
+	h.batchResults = nil
 	for _, stop := range h.engineStops {
 		stop()
 	}
@@ -784,6 +786,9 @@ func (h *Host) close() {
 	for _, engine := range engines {
 		_ = engine.Close()
 	}
+	for _, result := range results {
+		h.discard(result)
+	}
 	_ = h.files.close()
 }