Hi! Could you please help with reasoning on
1)why there can exist ‘blank’ Amplitude ID’s with no other corresponding User Properties, and at the same time
2)the ‘First seen’ and ‘Last seen’ are ‘Invalid date’?
![](https://uploads-us-west-2.insided.com/amplitude-en/attachment/8d20f6cb-f70b-4e1b-8e18-710fcd483518.png)
Hi! Could you please help with reasoning on
1)why there can exist ‘blank’ Amplitude ID’s with no other corresponding User Properties, and at the same time
2)the ‘First seen’ and ‘Last seen’ are ‘Invalid date’?
Hi
This usually happens when you are in the user look up UI and switch the project from the current project to a different one. If that user_id’s data is absent from that project, you will see this behavior.
Hope this helps.
If you don't have an Amplitude account, you can create an Amplitude Starter account for free and enjoy direct access to the Community via SSO. Create an Amplitude account. You can also create a Guest account below!
If you don't have an Amplitude account, you can create an Amplitude Starter account for free and enjoy direct access to the Community via SSO. Create an Amplitude account. Want to sign up as a guest? Create a Community account.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.