Why does Selenium write Exception... "Component not initialized"?

Question

Python

There is a piece of code where I can't figure out what the error is.
So:

def delete_widget(self, widget):
    try:
 <b>button_delete_widget = widget.find_element_by_css_selector("i.icon-trash.icon-2x")</b>
    except NoSuchElementException:
    self.add_widget(widget)
    sleep(WAIT_PERIOD)
    self.driver.switch_to.window(self.driver.window_handles[-1])
    button_delete_widget = widget.find_element_by_css_selector("i.icon-trash.icon-2x")
    button_delete_widget.click()
    self.wait_and_accept_allert(count=1)

def add_widget(self, widget):
    element.click()

The snag lies in the "fat" line of code.
Sometimes, Selenium works correctly and code execution goes to NoSuchElementException, but sometimes, I get the following error:
selenium.common.exceptions.WebDriverException: Message: [Exception... "Component not initialized" nsresult: "0xc1f30001 (NS_ERROR_NOT_INITIALIZED)" location: "JS frame :: chrome://marionette/content/modal.js :: get window :: line 199" data: no]

What could be causing this?
Why does Selenium write Exception... "Component not initialized"?

Answer 1

NS_ERROR_NOT_INITIALIZED (0xC1F30001)
An attempt was made to use a component or object which has not yet been initialized. These components usually provide an initialization method, often called Init, which must be called before other methods are used.

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