JS AlertBox throwing JavaScript Error: "e is null

Question

I am having a problem with a JS Alert box, it was suppose to be working but all of sudden this popped up.

selenium.common.exceptions.WebDriverException: Message: [JavaScript Error: "e is null" {file: "file:///var/folders/8t/n1tmxt2s4cjc_g3hc_4sm6_x3_m7_l/T/tmpTmBrlm/extensions/fxdriver@googlecode.com/components/command-processor.js" line: 7854}] ...

I dont know if you guys can help me out. It's python selenium code and browser is Firefox 32 to 34.

My Code is under

def testArticleDekExternalLinksTest(self):
        """Practitest id :305"""
        addArticlePage = AP.AddArticlePage(self.driver,"m.php?t=articles") 
        addArticlePage.getRandomEditorialArticle()
        keys = "https://www.google.com/?gws_rd=ssl"
        addArticlePage.clickDekExternalLinks()

        alert = self.driver.switch_to.alert
        print alert
        alert.send_keys(keys)
        alert.accept()
        self.assertTrue(addArticlePage.save(), "cannot save an Article")
        self.driver.refresh()
        addArticlePage.clickHtmlView(0)
        time.sleep(2)
        assert keys in addArticlePage.getDekContentUrlStripped()

        addArticlePage.loadUrl(addArticlePage.getPreviewUrl())
        articlePage = ArticlePage.ArticlePage(self.driver)

If i try to print the Alert out I can see the Alert Object even adding timing doesn't helps and weirdest part is it was working before and not working now.. Selenium version is 2.45.0

`alert.send_keys(keys)` ? I would suggest to remove those two lines and try — Saifur, Jun 04 '15 at 16:40
@Saifur I tried without sending keys... but it gives the same issue... — Muzamil Abbasi, Jun 04 '15 at 16:45

score 1 · Answer 1 · edited May 23 '17 at 12:23

Ok. It seems like a wait issue to me. try this with explicit wait and give the alert sometime to exist

def testArticleDekExternalLinksTest(self):
        """Practitest id :305"""
        addArticlePage = AP.AddArticlePage(self.driver,"m.php?t=articles") 
        addArticlePage.getRandomEditorialArticle()
        keys = "https://www.google.com/?gws_rd=ssl"
        addArticlePage.clickDekExternalLinks()

        WebDriverWait(self.driver, 10).until(EC.alert_is_present())
        alert = self.driver.switch_to.alert
        print alert
        alert.send_keys(keys)
        alert.accept()
        self.assertTrue(addArticlePage.save(), "cannot save an Article")
        self.driver.refresh()
        addArticlePage.clickHtmlView(0)
        time.sleep(2)
        assert keys in addArticlePage.getDekContentUrlStripped()

        addArticlePage.loadUrl(addArticlePage.getPreviewUrl())
        articlePage = ArticlePage.ArticlePage(self.driver)

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JS AlertBox throwing JavaScript Error: "e is null

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