diff --git a/Libraries/Core/Devtools/symbolicateStackTrace.js b/Libraries/Core/Devtools/symbolicateStackTrace.js
index 2e544149d7..7be076b3de 100644
--- a/Libraries/Core/Devtools/symbolicateStackTrace.js
+++ b/Libraries/Core/Devtools/symbolicateStackTrace.js
@@ -18,27 +18,38 @@ const {fetch} = require('fetch');
 
 import type {StackFrame} from 'parseErrorStack';
 
+function isSourcedFromDisk(sourcePath: string): boolean {
+  return !/^http/.test(sourcePath) && /[\\/]/.test(sourcePath);
+}
+
 async function symbolicateStackTrace(stack: Array<StackFrame>): Promise<Array<StackFrame>> {
   const devServer = getDevServer();
   if (!devServer.bundleLoadedFromServer) {
     throw new Error('Bundle was not loaded from the packager');
   }
+
+  let stackCopy = stack;
+
   if (SourceCode.scriptURL) {
-    for (let i = 0; i < stack.length; ++i) {
+    let foundInternalSource: boolean = false;
+    stackCopy = stack.map((frame: StackFrame) => {
       // If the sources exist on disk rather than appearing to come from the packager,
       // replace the location with the packager URL until we reach an internal source
       // which does not have a path (no slashes), indicating a switch from within
       // the application to a surrounding debugging environment.
-      if (/^http/.test(stack[i].file) || !/[\\/]/.test(stack[i].file)) {
-        break;
+      if (!foundInternalSource && isSourcedFromDisk(frame.file)) {
+        // Copy frame into new object and replace 'file' property
+        return {...frame, file: SourceCode.scriptURL};
       }
-      stack[i].file = SourceCode.scriptURL;
-    }
+
+      foundInternalSource = true;
+      return frame;
+    });
   }
 
   const response = await fetch(devServer.url + 'symbolicate', {
     method: 'POST',
-    body: JSON.stringify({stack}),
+    body: JSON.stringify({stack: stackCopy}),
   });
   const json = await response.json();
   return json.stack;