From 70f9294e15d73f8f221116cee032db859a183112 Mon Sep 17 00:00:00 2001
From: Jarred Sumner <jarred@jarredsumner.com>
Date: Tue, 5 Apr 2022 06:36:19 -0700
Subject: [PATCH] [bun:error] Fix exception

---
 packages/bun-error/index.tsx    | 1 +
 packages/bun-error/sourcemap.ts | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/bun-error/index.tsx b/packages/bun-error/index.tsx
index a627a7a8d3..5211af8ea9 100644
--- a/packages/bun-error/index.tsx
+++ b/packages/bun-error/index.tsx
@@ -1390,6 +1390,7 @@ export function renderRuntimeError(error: Error) {
               remapped[1];
         }, console.error);
       } else {
+        if (!mappings) return null;
         var frame = exception.stack.frames[frameIndex];
         const { line, column_start } = frame.position;
         const remapped = remapPosition(mappings, line, column_start);
diff --git a/packages/bun-error/sourcemap.ts b/packages/bun-error/sourcemap.ts
index 23bd4cf8a8..bee83f559c 100644
--- a/packages/bun-error/sourcemap.ts
+++ b/packages/bun-error/sourcemap.ts
@@ -281,7 +281,7 @@ export function fetchAllMappings(files, signal) {
 
   for (const [file, indices] of [...map.entries()]) {
     const mapped = fetchMappings(file, signal);
-    if (mapped.then) {
+    if (mapped?.then) {
       var resolvers = [];
       for (let i = 0; i < indices.length; i++) {
         results[indices[i]] = new Promise((resolve, reject) => {