---
title: "OnErrorEventHandlerNonNull | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Interface OnErrorEventHandlerNonNull

-   OnErrorEventHandlerNonNull(  
        event: string | Event,  
        source?: string,  
        lineno?: number,  
        colno?: number,  
        error?: Error,  
    ): any[](#onerroreventhandlernonnull)
    
    #### Parameters
    
    -   event: string | Event
    -   `Optional`source: string
    -   `Optional`lineno: number
    -   `Optional`colno: number
    -   `Optional`error: Error
    
    #### Returns any