Crash when going on background

Whenever I go to another app, it goes onPause, it crashes with this error

10-04 18:26:46.166 14402-14409/? E/zygote: Failed sending reply to debugger: Broken pipe
10-04 18:26:56.055 14402-14402/com.mancj.example E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.mancj.example, PID: 14402
java.lang.RuntimeException: Parcel: unable to marshal value com.mancj.example.custom.Product@f87e57b
at android.os.Parcel.writeValue(Parcel.java:1712)
at android.os.Parcel.writeList(Parcel.java:865)
at com.mancj.materialsearchbar.MaterialSearchBar$SavedState.writeToParcel(MaterialSearchBar.java:1086)
at android.os.Parcel.writeParcelable(Parcel.java:1731)
at android.os.Parcel.writeValue(Parcel.java:1637)
at android.os.Parcel.writeSparseArray(Parcel.java:905)
at android.os.Parcel.writeValue(Parcel.java:1662)
at android.os.Parcel.writeArrayMapInternal(Parcel.java:777)
at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1506)
at android.os.Bundle.writeToParcel(Bundle.java:1181)
at android.os.Parcel.writeBundle(Parcel.java:817)
at android.os.Parcel.writeValue(Parcel.java:1628)
at android.os.Parcel.writeArrayMapInternal(Parcel.java:777)
at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1506)
at android.os.Bundle.writeToParcel(Bundle.java:1181)
at android.app.IActivityManager$Stub$Proxy.activityStopped(IActivityManager.java:4700)
at android.app.ActivityThread$StopInfo.run(ActivityThread.java:4095)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6673)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:769)

Reproduce the crash by sending the Android app to the background, then inspect MaterialSearchBar.java at SavedState.writeToParcel around line 1086. Trace how the custom Product value reaches parceling and verify that backgrounding no longer raises the reported RuntimeException.

Written by the indexing model from the issue text.