fix(nextjs): Handle __nextGetStaticStore returning undefined

.changeset/twelve-books-glow.md

@@ -0,0 +1,5 @@
+---
+"@clerk/nextjs": patch
+---
+
+Bug fix: Handle `nextGetStore.getStore()` returning `undefined`. Previously a TypeError would occur, when `pagePath` was accessed.

packages/nextjs/src/server/nextFetcher.ts

@@ -5,7 +5,7 @@ type Fetcher = typeof globalThis.fetch;
  */
 type NextFetcher = Fetcher & {
   readonly __nextPatched: true;
-  readonly __nextGetStaticStore: () => { getStore: () => StaticGenerationAsyncStorage };
+  readonly __nextGetStaticStore: () => { getStore: () => StaticGenerationAsyncStorage | undefined };
 };
 
 /**

packages/nextjs/src/server/protect.ts

@@ -134,7 +134,7 @@ const isAppRouterInternalNavigation = (req: Request) =>
 
 const isPagePathAvailable = () => {
   const __fetch = globalThis.fetch;
-  return Boolean(isNextFetcher(__fetch) ? __fetch.__nextGetStaticStore().getStore().pagePath : false);
+  return Boolean(isNextFetcher(__fetch) ? __fetch.__nextGetStaticStore().getStore()?.pagePath : false);
 };
 
 const isPagesRouterInternalNavigation = (req: Request) => !!req.headers.get(nextConstants.Headers.NextjsData);