From 8bec82f5704bea1c043bcd99aa2b2da9fa256944 Mon Sep 17 00:00:00 2001
From: brandon-fry <fry311@gmail.com>
Date: Fri, 9 Oct 2020 14:49:28 -0500
Subject: [PATCH] Fix undefined fileName in getFileName

When attempting to find the file name of the caller, getFileName grabs a stack
trace and attempts to walk up it to find the first file name that is not the
bindings.js file. For some reason, in my environment, the bindings.js file
name is 'undefined' (see output below). In this case 'undefined' !== __filename
and the for loop is stopped, leaving fileName undefined and causing an error
when indexOf is invoked on fileName. To fix, an additional check for undefined
fileName is added in the loop.

fileName:  undefined
function:  getFileName
fileName:  undefined
function:  bindings
fileName:  undefined
function:  eval
fileName:  /projects/node-crfpp/node-crfpp-bundle.js
function:  ./node-crfpp.js
---
 bindings.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bindings.js b/bindings.js
index 226b37f..67df040 100644
--- a/bindings.js
+++ b/bindings.js
@@ -155,7 +155,7 @@ exports.getFileName = function getFileName(calling_file) {
   Error.prepareStackTrace = function(e, st) {
     for (var i = 0, l = st.length; i < l; i++) {
       fileName = st[i].getFileName();
-      if (fileName !== __filename) {
+      if (fileName && fileName !== __filename) {
         if (calling_file) {
           if (fileName !== calling_file) {
             return;