Do android sensors get outliers?

I read the data from Huawei watch2"s ppg sensor, but the result is either a very small value (1e-40) or NaN. Try the other sensors. They all seem to be working. Ask for guidance reason, thank you!

Sensor android
Jun.03,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e48311-271d1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e48311-271d1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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