Magento2: PHP message: PHP Fatal error: Uncaught TypeError: Argument 1 passed to iterator_to_array() must implement interface Traversable

[woei66]

Steps to reproduce

1. composer create-project --repository-url=https://repo.magento.com/ magento/project-community-edition=2.1.0
2. php bin/magento setup:static-content:deploy en_US zh_Hant_TW
3. set zh_Hant_TW as the default language
4. visit the backend url

5. centos 6.7+ php7

   Expected result

6. login page

   Actual result

error] 16549#0: *1 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught TypeError: Argument 1 passed to iterator_to_array() must implement interface Traversable, null given in /usr/share/nginx/magento2/vendor/magento/framework/View/Element/Html/Calendar.php:72
Stack trace:
#0 /usr/share/nginx/magento2/vendor/magento/framework/View/Element/Html/Calendar.php(72): iterator_to_array(NULL)
#1 /usr/share/nginx/magento2/vendor/magento/framework/View/Element/AbstractBlock.php(659): Magento\Framework\View\Element\Html\Calendar->_toHtml()
#2 /usr/share/nginx/magento2/vendor/magento/framework/View/Layout.php(542): Magento\Framework\View\Element\AbstractBlock->toHtml()
#3 /usr/share/nginx/magento2/vendor/magento/framework/View/Layout.php(518): Magento\Framework\View\Layout->_renderBlock('head.calendar')
#4 /usr/share/nginx/magento2/var/generation/Magento/Framework/View/Layout/Interceptor.php(206): Magento\Framework\View\Layout->renderNonCachedElement('head.calendar')
#5 /usr/share/nginx/magento2/vendor/magento/framework/View/Layout.php(472): Magent" while reading response header from upstream,

[woei66]

I traced the source code.
protected function _toHtml() { $localeData = (new DataBundle())->get($this->_localeResolver->getLocale()); // get days names $daysData = $localeData['calendar']['gregorian']['dayNames']; $this->assign( 'days', [ 'wide' => $this->encoder->encode(array_values(iterator_to_array($daysData['format']['wide']))), 'abbreviated' => $this->encoder->encode( array_values(iterator_to_array($daysData['format']['abbreviated'])) ), ] );
in the source code, the $this->_localeResolver->getLocale() return zh_Hant_TW and the $localeData is null

[HirokazuNishi]

This is not Magento's bug, but same in Japanese & Korean.
It's caused by libICU and PHP.
Please read my gist.

If you can change your Linux distribution from RHEL clones to Ubuntu, this issue will be resolved.

[piotrekkaminski]

Internal issue MAGETWO-60828

[alena-marchenko]

Hi @woei66

Fix for MAGETWO-60828 is merged to develop branch, closing the issue.
Thank you.

[korostii]

Hi @alena-marchenko, please do explain the following: how does a bunch of commits in develop branch helps merchabts running the last released version (2.1.7 at the moment)? How can one benefit from this fix?

Wouldn't it be logical to keep the issue open until the fix is present in an official release?

[archipfe]

/vendor/magento/framework/View/Element/Html/Calendar.php

Fine 88 line

array_values(iterator_to_array($monthsData['format']['abbreviated']))

Change to

                array_values(
                    iterator_to_array(
                        null !== $monthsData->get('format')->get('abbreviated')
                        ? $monthsData['format']['abbreviated']
                        : $monthsData['format']['wide']
                    )

)

https://github.com/magento/magento2/commit/c7e5edbf719e9de98bf0d15f7e36a6f0887a1601

[TomashKhamlai]

This issue is fixed now on branch 'develop' (Magento v2.2.0) but is still present on '2.1-develop' (Magento v2.1.7)

[korostii]

Hi @TomashKhamlai
Could you please have this issue reopened until the issue is released for 2.1.x ?
BTW, Is there an internal ticket scheduling a backport to 2.1.x ?

[sneh-tidbit]

Yes, I understand the issue but what should I do now to remove this error.
error: Fatal error: Uncaught TypeError: Argument 1 passed to iterator_to_array() must implement interface Traversable, null given in /home/rozander/public_html/epicdashcam.com/vendor/magento/framework/View/Element/Html/Calendar.php:86 Stack trace: #0 /home/rozander/public_html/epicdashcam.com/vendor/magento/framework/View/Element/Html/Calendar.php(86): iterator_to_array(NULL) #1 /home/rozander/public_html/epicdashcam.com/vendor/magento/framework/View/Element/AbstractBlock.php(659): Magento\Framework\View\Element\Html\Calendar->_toHtml() #2 /home/rozander/public_html/epicdashcam.com/vendor/magento/framework/View/Layout.php(542): Magento\Framework\View\Element\AbstractBlock->toHtml() #3 /home/rozander/public_html/epicdashcam.com/vendor/magento/framework/View/Layout.php(518): Magento\Framework\View\Layout->_renderBlock('head.calendar') #4 /home/rozander/public_html/epicdashcam.com/var/generation/Magento/Framework/View/Layout/Interceptor.php(206): Magento\Framework\View\Layout->renderNonCachedElement('head.calendar') #5 /home/rozand in /home/rozander/public_html/epicdashcam.com/vendor/magento/framework/View/Element/Html/Calendar.php on line 86

Now, I cannot come into backend because of this issue. how would I solve this issue anyhow that can be a patch or something else but how would I solve this issue?

[TomashKhamlai]

Hello @sneh-tidbit!
What version of Magento is currently installed on your server?

[woshka]

I have reported this issue in here
https://github.com/magento/magento2/issues/14068

[wltprgm]

This issue is not solved.

vendor/magento/framework/View/ElementHtml/Calendar.php line 75 caused the same error.