Bug None Property Value

Hi @Marta Catalá ,

Thanks for contacting support. It is important to remember that Amplitude is an events-based Platform and so any events we ingest are ingested with the user and event properties at the time they occurred. Our event data is historical and immutable and cannot be changed once ingested. So when you query on some Event A where some_property=X, we are looking for the users who have triggered Event A and some_property was equal to X at the time the event occurred. 

If you are seeing none for some users but you are seeing a value at the top of their user profile, this just means that the user currently has the value of X on their profile as this is their most recent event. The none comes from the user not having that property or a value for it at the time the event occurred. 

If you do not wish to see these '(none)' values, then you will need to make sure that the user property you are looking at is set by the time of the event you are looking at.

Can you link me your dashboard and what specific data points you are unsure of or think are wrong? I can then look into this for you but if (none) is being sent a lot, you would need to make sure that you are adding a value to that property when you send the event. I look forward to your reply!

Kind Regards,
Denis

Hey Denis,

Let me know if you prefer to talk via private message..

In this dashboard, you can see the 2 variants we try to test. They are segmented by context.url.page property. As you can see the variant B should have context.url.page=erudit.ai/variant. This one has only 10 users. This results is incorrect. 

In this dashboard, you can see the group of users with context.url.page=none. In this spreadsheet, you can see the users with none value in this current month. 

Also, what we are seeing now is that when I do any event in the spefic page, the event is triggered in user look ap but the context.url.page is not erudit.ai/variant but erudit/. The specific page is this one. https://www.erudit.ai/variant

Do you know if this none bug could see the reason why we are not getting all the data.

Thanks in advance, Denis!

Hi @Marta Catalá ,

I took a look at your chart but I do not see any Variant B. I see Variant 1- Human and Variant 1- Product. Is Variant 2 - Product what you are referring to? Please use the exact names in Amplitude so I can assist you better. 

I looked at the dashboard here and I see the (none) values. The (none) value is not a bug. As I have said, Amplitude is an events-based Platform and so any events we ingest are ingested with the user and event properties at the time they occurred. If the property is not on the event at the time it occurred, it will be (none). It is also important to note in your funnel that the user segment filters on the funnel will only apply to the first step, and not the entire funnel. If you want it to apply to the entire funnel, you need to add that filter to the subsequent events.

If there is a particular User ID/Device ID/Amplitude ID that you can point out that should be in the funnel but is not, I am more than happy to look into it for you so we can ensure you understand the funnel and you are set up for success @Marta Catalá !

Hey @Denis Holmes !🤓

Thanks for the help! I am not following you. Maybe I am not interpreting correctly the dashboard. What I see is than during this august week, there are several page events that have been ocurring, so the users have done “page views” in our website. However, that august page views events, bring the property page.context.url with value none. You say “If the property is not on the event at the time it occurred, it will be (none)”, but the property was included in august, as far as I know. 

So, I have some questions: Why the page.context.url has value none? the Event was fired in august, so it would make sense to have any value inside the page.context.url, right? such as erudit.ai/, or erudit.ai/product.

 Which would be the use case of thaat property being none once both event and property exists? Which Page has seen the user to receive non value?

Also, related to the context.url property, we are having another issue. 

We are seeing now that when I do any event in the spefic page, “erudit/variant” the event is triggered in user look up but the context.url.page is not erudit.ai/variant but erudit/. If I navigate through other pages, I receive the  context.url.page correctly. This page is being included in a AB test via optimize. Do you know if this is something to do with the fact that we are not receiving the correct  context.url.page, Denis?

Thanks a lot!

Also Denis, you can see the context.page.referrer brings more users vs the context.page.url in the case of erudit.ai/variant

I share this with you because I guess it does not make sense. If some page is on referrer is because somehow that page was before the main page of the event fired. So basically context.page.url should have more "events" than the referrer right?

Thanks @Denis Holmes !

I really appreacite you effort. All this explanation is super useful for me. 

Regarding the latest point about why context.url. /variant, is not appearing, I have attached you a video loom and the user look up url of the event.

Also,  I think what you are commenting about the property context.page.url as an user or event property.

I think I am seeing the user property of context.page.url in the Look up section, Denis. 

But it makes sense for me check the event property. As this property must be related to the event of the page view or click. But if you see the look up section and navigate though an specific event, there is not event property for the context.page.url (just user property): does it make sense to you?

Here you have the look up section url

https://analytics.amplitude.com/erudit/project/293559/search/amplitude_id%3D447175160998

Thanks again, Denis

Hi @Marta Catalá ,

I do no see any loom attached. Only a screenshot. Yes, I see context.page.url is 

https://www.erudit.ai/ and the referrer is https://www.erudit.ai/variant. So these properties and their values are from either events or identify calls. Have you spoken with your Engineers about this yes Marta? I would recommend you do so. 

I can see context.page.url in the event properties. Please see this specific event. We can clearly see the event has the event property of context.page.url AND a user property of the exact same name. So if you are looking at the event property for context.page.url, it will be event based. Since it is event based, it will be (none) if the property does not have a value at the time of the event.

If you think a certain event is wrong, then please link me;
1. The specific event in question.
2. The name and date of the event. 
3. What values you expected?
4. What values are being shown?
5. A payload for the event from your source to show we should have ingested a different value. 

Thanks Marta.

Kind Regards,
​​​​​​​Denis

Hey @Denis Holmes thank you for your reply!

Here is the loom where you can see the property has not a value of /variant although we are interacting with that page. Anyway, it seems I have fix that problem. The reason why the context.url.page was https://www.erudit.ai/ instead of https://www.erudit.ai/variant was the canonical tag we included in the page code.

Anyway, the none value issue continue being a problem for us. But I have understand that I need to talk with our engineering team. 

I have a question about user property though. The user property won’t be updated after the event is triggered? Which are the situations where a user property such as context.url.page can be updated, though?

Thanks in advance, Denis.

@Marta Catalá ,

A user property will update if it is included in the event payload. It can also be updated with the Identify API at the top of the user profile but the change will not be visible on an event until the next event is sent. 

Focusing on (none) once more, can you link me a chart, and please specify in the greatest detail possible ;
1. The chart link
2. Where do you see (none)? What specific day?
3. Which user ID or Amplitude ID?
4. What did you expect the user to have instead of (none) and why?

Kind Regards,
Denis

Hey Denis, thanks for the help. I think we must talk with our dev team as this a something related to the event configuration. I really appreaciate your work on here. 

Thanks!