# Cannot read property 'whiteListIframe' of undefined

**URL:** https://meta.discourse.org/t/cannot-read-property-whitelistiframe-of-undefined/111927
**Category:** Support
**Created:** [March 18, 2019, 1:54pm UTC](https://meta.discourse.org/t/cannot-read-property-whitelistiframe-of-undefined/111927 "2019-03-18T13:54:17Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![Rahul\_Goswami](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/rahul_goswami/32/139414_2.png) [@Rahul\_Goswami](https://meta.discourse.org/u/Rahul_Goswami)
#### Post date: [March 18, 2019, 1:54pm UTC](https://meta.discourse.org/t/cannot-read-property-whitelistiframe-of-undefined/111927/1 "2019-03-18T13:54:17Z")

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Hi

I am getting this error “Cannot read property ‘whiteListIframe’ of undefined”. I am loading a iframe into my Discourse. Because of this error the javascript function of the website which is loaded in iframe is not working.

 ![image](https://global.discourse-cdn.com/meta/original/3X/b/2/b2276d7eccce8fee5fd82bdae217aa16edd03212.png)

Is there any way through which i can resolve the whitelist frame error in my current discourse version or do i need to upgrade the version.

Please help me resolve this error.

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### Author: ![zogstrip](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/zogstrip/32/512781_2.png) [@zogstrip](https://meta.discourse.org/u/zogstrip)
#### Post date: [March 18, 2019, 2:58pm UTC](https://meta.discourse.org/t/cannot-read-property-whitelistiframe-of-undefined/111927/2 "2019-03-18T14:58:56Z")

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Easiest way to solve this is to update to latest version of Discourse.

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### Author: ![sam](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/sam/32/102149_2.png) [@sam](https://meta.discourse.org/u/sam)
#### Post date: [March 19, 2019, 4:25am UTC](https://meta.discourse.org/t/cannot-read-property-whitelistiframe-of-undefined/111927/3 "2019-03-19T04:25:48Z")

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Also looks like this is coming from a 3rd party plugin, it is possible you have a plugin that no longer works on Discourse.

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### Author: ![system](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/system/32/443519_2.png) [@system](https://meta.discourse.org/u/system)
#### Post date: [May 3, 2019, 5:38am UTC](https://meta.discourse.org/t/cannot-read-property-whitelistiframe-of-undefined/111927/4 "2019-05-03T05:38:54Z")

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