java - Android ClassCastException only in release build -

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i have simple code nicknames recipient's list in android app:

public void additemstospinner(list<recipient> list) {     list<string> nicks = new arraylist<>();      (recipient recipient: list) {         nicks.add(recipient.getnickname());     } }

it works fine when try debug mode, if release through crashlytics beta, crashes. error this:

java.lang.classcastexception: dbu cannot cast lh

any ideas welcome.


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