diff --git a/ui-electrobun/src/bun/index.ts b/ui-electrobun/src/bun/index.ts
index 1bd55df..bf7da04 100644
--- a/ui-electrobun/src/bun/index.ts
+++ b/ui-electrobun/src/bun/index.ts
@@ -5,7 +5,7 @@
  * Fix #2: Path traversal guard on files.list/read/write via path-guard.ts.
  */
 
-import { BrowserWindow, BrowserView, Updater } from "electrobun/bun";
+import { BrowserWindow, BrowserView, Updater, Electrobun } from "electrobun/bun";
 import { PtyClient } from "./pty-client.ts";
 import { settingsDb } from "./settings-db.ts";
 import { sessionDb } from "./session-db.ts";
@@ -192,4 +192,25 @@ mainWindow = new BrowserWindow({
   },
 });
 
+// Prevent GTK's false Ctrl+click detection from closing the window on initial load.
+// WebKitGTK reports stale modifier state (0x14 = Ctrl+Alt) after SIGTERM of previous instance,
+// which Electrobun interprets as a Cmd+click → "open in new window" → closes the main window.
+// Fix: intercept new-window-open globally and suppress it.
+try {
+  // @ts-ignore — electrobunEventEmitter is an internal export
+  const mod = await import("electrobun/bun");
+  const emitter = (mod as any).electrobunEventEmitter ?? (mod as any).default?.electrobunEventEmitter;
+  if (emitter?.on) {
+    emitter.on("new-window-open", (event: any) => {
+      console.log(`[new-window-open] Blocked false Ctrl+click: ${JSON.stringify(event?.detail ?? event)}`);
+      if (event?.preventDefault) event.preventDefault();
+    });
+    console.log("[new-window-open] Handler registered successfully");
+  } else {
+    console.warn("[new-window-open] Could not find event emitter in electrobun/bun exports");
+  }
+} catch (err) {
+  console.warn("[new-window-open] Could not register handler:", err);
+}
+
 console.log("Agent Orchestrator (Electrobun) started!");