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Cannot read property of 'item' undefined, my itemwindow becomes undefined when the check happens

BMM Archive · July 15, 2026

Preserved forum archive. This topic stores the original first post and locally mirrored RPG Maker Web attachments when available. It is posted by the BMMPlay archive account, not by the original creator.

Original Source

  • Original title: Cannot read property of 'item' undefined, my itemwindow becomes undefined when the check happens
  • Original author: Mitchel
  • Original date: October 4, 2016
  • Source thread: https://forums.rpgmakerweb.com/threads/cannot-read-property-of-item-undefined-my-itemwindow-becomes-undefined-when-the-check-happens.69244/
  • Source forum path: Game Development Engines > RPG Maker Javascript Plugins > Javascript/Plugin Support

Summary

Im working on a menu for viewable documents, sort of like a collections/document menu. I've have the menu displaying and the category window working, but when I test the item window after selecting the Item I want to use, I keep getting a Cannot read property of 'item' undefined. I used the developer's tools to find out where it's crashing and it crashes in Scene_ItemBase.prototype.item(). The item window for some reason it undefined, but I have it defined in the Scene_Collectibles section of my code. I checked to see if...

Archived First Post

Im working on a menu for viewable documents, sort of like a collections/document menu. I've have the menu displaying and the category window working, but when I test the item window after selecting the Item I want to use, I keep getting a Cannot read property of 'item' undefined. I used the developer's tools to find out where it's crashing and it crashes in Scene_ItemBase.prototype.item(). The item window for some reason it undefined, but I have it defined in the Scene_Collectibles section of my code. I checked to see if the other plugins i'm using was casuing this issue and it's not. I put this in a seperate project with no other plugins and i still get the same results. Here's the code i've been working on and some screenshot of the crashes. If anyone can help, it will be much appreciated!

View attachment Collectible Menu.js

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Location of Issue.png
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