Zone errors

[naveedahmed1]

**I'm submitting a **

[x] bug report

Current behavior

After upgrading to latest release (2.4.8), I am receiving below error very frequently:

TypeError: Cannot read property 'length' of null
    at Zone._updateTaskCount (http://localhost:49547/content/js/zone.js:224:46)
    at Zone.cancelTask (http://localhost:49547/content/js/zone.js:214:18)
    at http://localhost:49547/content/js/zone.js:1575:31
    at clearInterval (eval at createNamedFn (http://localhost:49547/content/js/zone.js:1483:17), <anonymous>:3:40)
    at eval (http://localhost:49547/content/app/shared/services/http-loading.js:130:17)
    at ZoneDelegate.invokeTask (http://localhost:49547/content/js/zone.js:363:31)
    at Object.onInvokeTask (http://localhost:49547/node_modules/@angular/core/bundles/core.umd.js:3971:41)
    at ZoneDelegate.invokeTask (http://localhost:49547/content/js/zone.js:362:36)
    at Zone.runTask (http://localhost:49547/content/js/zone.js:166:47)
    at ZoneTask.invoke (http://localhost:49547/content/js/zone.js:416:38)
    at data.args.(anonymous function) (http://localhost:49547/content/js/zone.js:1527:25)

Issue seems to be with below blocks of code in zone.js:

Zone.prototype._updateTaskCount = function (task, count) {
            var zoneDelegates = task._zoneDelegates;
            if (count == -1) {
                task._zoneDelegates = null;
            }
            for (var i = 0; i < **zoneDelegates.length**; i++) {
                zoneDelegates[i]._updateTaskCount(task.type, count);
            }
        };

Zone.prototype.cancelTask = function (task) {
            task._transitionTo(canceling, scheduled, running);
            this._zoneDelegate.cancelTask(this, task);
            **this._updateTaskCount(task, -1);**
            task._transitionTo(notScheduled, canceling);
            task.runCount = 0;
            return task;
        };

function createNamedFn(name, delegate) {
    try {
        **return (Function('f', "return function " + name + "(){return f(this, arguments)}"))(delegate);**
    }
    catch (error) {
        // if we fail, we must be CSP, just return delegate.
        return function () {
            return delegate(this, arguments);
        };
    }
}

Please tell us about your environment:

• Angular version: 2.4.8

[DzmitryShylovich]

pls add a plunkr

[JiaLiPassion]

This is the zone.js issue, I have made a PR to fix this one, angular/zone.js#642

[DzmitryShylovich]

@naveedahmed1 close the issue, as it's not angular related, pls. thx

[naveedahmed1]

Thank you

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