diff --git a/packages/app/src/context/global-sync/child-store.ts b/packages/app/src/context/global-sync/child-store.ts
index 3fe67e4fbe..29202110af 100644
--- a/packages/app/src/context/global-sync/child-store.ts
+++ b/packages/app/src/context/global-sync/child-store.ts
@@ -96,8 +96,15 @@ export function createChildStoreManager(input: {
     lifecycle.delete(directory)
     const dispose = disposers.get(directory)
     if (dispose) {
-      dispose()
       disposers.delete(directory)
+      // Defer the actual solid-js root disposal. When disposeDirectory runs
+      // from pinForOwner's onCleanup during a parent remount, calling
+      // dispose() here triggers a nested cleanNode cascade on the inner
+      // root while the outer cascade is mid-traversal, which corrupts
+      // solid-js's graph walk state and throws `Cannot read properties of
+      // null (reading '1')` at chunk-*.js:992. Running dispose on a
+      // microtask lets the outer cleanup finish first.
+      queueMicrotask(dispose)
     }
     delete children[directory]
     input.onDispose(directory)