Firebase Docs Reference Interface: FirebaseArrayIndexError admin.FirebaseArrayIndexError interface static Composite type which includes both a FirebaseError object and an index which can be used to get the errored item. Properties error admin.FirebaseError The error object. index number The index of the errored item within the original array passed as part of the called API method. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated April 4, 2017.