I keep getting this exception thrown from inside Elm, so far only from
Chrome Version 51.0.2704.103 m
```
elm.js:2417 Uncaught TypeError: Cannot read property 'ctor' of null
```
Where that line and the surrounding context is purely Elm generated code,
and is:
```javascript
// STEP PROCESSES // Line 2411
function step(numSteps, process)
{
while (numSteps < MAX_STEPS)
{
var ctor = process.root.ctor; // Line 2417 -- This is the error: Uncaught
TypeError: Cannot read property 'ctor' of null
if (ctor === '_Task_succeed')
{
while (process.stack && process.stack.ctor === '_Task_onError')
{
process.stack = process.stack.rest;
}
if (process.stack === null)
```
The same javascript seems to run fine in firefox, IE, and edge, this only
seems to happen in Chrome and only 'sometimes'. It seems to happen pretty
quickly during loading and if it does not happen at the start then it does
not seem to happen. I've not been able to find code to whittle down that
lets my app still do anything while still causing this error.
The 'step' function is being called from the 'work' function of (and with
context):
```
javascript
// WORK QUEUE
var working = false;
var workQueue = [];
function enqueue(process) {
workQueue.push(process);
if (!working) {
setTimeout(work, 0);
working = true;
}
}
function work() {
var numSteps = 0;
var process;
while (numSteps < MAX_STEPS && (process = workQueue.shift())) {
numSteps = step(numSteps, process); // This is the place in the callstack
before step
}
if (!process) {
working = false;
return;
}
setTimeout(work, 0);
}
```
Chrome is not reporting anything in the stack below `work` so this appears
to be during the setTimeout callback set a few lines prior to work that
calls work.
Any thoughts as to the cause?
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