From 6c7dd1577433195ee61021f5e37dfc6724f3d1a4 Mon Sep 17 00:00:00 2001
From: Jasper De Moor <jasperdemoor@gmail.com>
Date: Fri, 8 Mar 2019 19:17:28 +0100
Subject: [PATCH] check if there is an original mapping before trying to get
 location of that mapping

---
 packages/core/parcel-bundler/src/SourceMap.js | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/packages/core/parcel-bundler/src/SourceMap.js b/packages/core/parcel-bundler/src/SourceMap.js
index 222dc3c3365..ea3455c6782 100644
--- a/packages/core/parcel-bundler/src/SourceMap.js
+++ b/packages/core/parcel-bundler/src/SourceMap.js
@@ -298,8 +298,9 @@ class SourceMap {
       generatedPosition.line,
       generatedPosition.column
     );
+
     let mapping = this.mappings[index];
-    if (!mapping) {
+    if (!mapping || !mapping.original) {
       return null;
     }
 
@@ -317,11 +318,13 @@ class SourceMap {
       originalPosition.column,
       'original'
     );
+
+    let mapping = this.mappings[index];
     return {
-      source: this.mappings[index].source,
-      name: this.mappings[index].name,
-      line: this.mappings[index].generated.line,
-      column: this.mappings[index].generated.column
+      source: mapping.source,
+      name: mapping.name,
+      line: mapping.generated.line,
+      column: mapping.generated.column
     };
   }