From 154e1833443f0fc32f9cb8df1846e08f8f30aec6 Mon Sep 17 00:00:00 2001
From: Ashok Menon <ashokmenon@fb.com>
Date: Thu, 12 Jan 2017 16:21:31 -0800
Subject: [PATCH] Fixing RN Debugger

Reviewed By: cwdick, javache

Differential Revision: D4409257

fbshipit-source-id: 062c798d1a1c9ad90884599ed262412c1dd51359
---
 ReactCommon/cxxreact/Instance.cpp | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/ReactCommon/cxxreact/Instance.cpp b/ReactCommon/cxxreact/Instance.cpp
index 9840973c6..1ac0885f2 100644
--- a/ReactCommon/cxxreact/Instance.cpp
+++ b/ReactCommon/cxxreact/Instance.cpp
@@ -73,10 +73,16 @@ void Instance::loadScriptFromFile(const std::string& filename,
                     "fileName", filename);
 
   std::unique_ptr<const JSBigFileString> script;
-  RecoverableError::runRethrowingAsRecoverable<std::system_error>(
-    [&filename, &script]() {
-      script = JSBigFileString::fromPath(filename);
-    });
+
+  // This function can be called in order to change the Bridge's Source URL.
+  // In that case, the filename will be empty, and we should not attempt to
+  // load it.
+  if (!filename.empty()) {
+    RecoverableError::runRethrowingAsRecoverable<std::system_error>(
+      [&filename, &script]() {
+        script = JSBigFileString::fromPath(filename);
+      });
+  }
 
   nativeToJsBridge_->loadApplication(nullptr, std::move(script), sourceURL);
 }