I have probably similar error while try to add domain by click on Blacklist button on Query Log
What device is behind this 10.0.2.6 address ?
That is indeed not a valid DNS name that's being queried.
While you can query for non valid domain names, Pi-hole seems to have some kind of sanity check that prevents adding them:
Quick DuckDuck:
- A domain name consists of minimum two and maximum 63 characters.
- All letters from a to z, all numbers from 0 to 9 and a hyphen (-) are possible.
- A domain name mustn't consist of a hyphen (-) on the third and fourth position at the same time.
https://www.dnsbelgium.be/en/register-your-domain-name/valid-domain-name
it's iPhone only 
Post a debug token for the devs/mods to inspect?
pihole -d
My guess would be that you manually ran a mis-spelled nslookup for that https://app-measurement.com/ URL.
No need to block that, it's not a domain name.
I suspect wrong implementation from one of the Google related apps on that iPhone.
I believe that domain belongs to Google (or is related).
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That would also explain it.
Related, @WaLLy3K noticed the same domain. Turns out to be related to the firebase SDK, I think.
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pi@ph5:~ $ host app-measurement.com
app-measurement.com has address 172.217.17.78
app-measurement.com has IPv6 address 2a00:1450:400e:807::200e
pi@ph5:~ $ whois 172.217.17.78
[..]
NetName: GOOGLE
[..]
EDIT: sounds like a bug 
Excellent find.
Not using Twitter, I'd never would've caught that one.
Any cure available yet?
Still exist. I'll try to find an app makes this but don't know how yet 
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