diff --git a/src/hooks/internal-hooks.ts b/src/hooks/internal-hooks.ts
index 4a29acb8b..08a642a17 100644
--- a/src/hooks/internal-hooks.ts
+++ b/src/hooks/internal-hooks.ts
@@ -200,8 +200,23 @@ export interface InternalHookEvent {
 
 export type InternalHookHandler = (event: InternalHookEvent) => Promise<void> | void;
 
-/** Registry of hook handlers by event key */
-const handlers = new Map<string, InternalHookHandler[]>();
+/**
+ * Registry of hook handlers by event key.
+ *
+ * Uses a globalThis singleton so that registerInternalHook and
+ * triggerInternalHook always share the same Map even when the bundler
+ * emits multiple copies of this module into separate chunks (bundle
+ * splitting). Without the singleton, handlers registered in one chunk
+ * are invisible to triggerInternalHook in another chunk, causing hooks
+ * to silently fire with zero handlers.
+ */
+const _g = globalThis as typeof globalThis & {
+  __openclaw_internal_hook_handlers__?: Map<string, InternalHookHandler[]>;
+};
+if (!_g.__openclaw_internal_hook_handlers__) {
+  _g.__openclaw_internal_hook_handlers__ = new Map<string, InternalHookHandler[]>();
+}
+const handlers = _g.__openclaw_internal_hook_handlers__;
 const log = createSubsystemLogger("internal-hooks");
 
 /**