Crash when reading battery level

I am accessing a MetaWear sensor from an iOS app.   I am experiencing intermittant crashes when I ask for the battery life.  The crash is a SIGSERV at the following line of code: -[MBLMetaWear peripheral:didUpdateValueForCharacteristic:error:] (MBLMetaWear.m:1531)

Is there other state I should be checking before I ask for the battery life?

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