diff --git a/.changeset/brown-eels-retire.md b/.changeset/brown-eels-retire.md
new file mode 100644
index 000000000000..e4b2baaed188
--- /dev/null
+++ b/.changeset/brown-eels-retire.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-vercel': patch
+---
+
+[fix] don't fail on unknown error message
diff --git a/packages/adapter-vercel/index.js b/packages/adapter-vercel/index.js
index a4dca08a570c..6ce0637d4794 100644
--- a/packages/adapter-vercel/index.js
+++ b/packages/adapter-vercel/index.js
@@ -315,7 +315,7 @@ async function create_function_bundle(builder, entry, dir, runtime) {
 
 		if (error.message.startsWith('Failed to resolve dependency')) {
 			const match = /Cannot find module '(.+?)' loaded from (.+)/;
-			const [, module, importer] = match.exec(error.message);
+			const [, module, importer] = match.exec(error.message) ?? [, error.message, '(unknown)'];
 
 			if (!resolution_failures.has(importer)) {
 				resolution_failures.set(importer, []);