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Cannot Remove Property 'removeAgro' of undefined

BMM Archive · July 15, 2026

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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 Remove Property 'removeAgro' of undefined
Original author: Black Alchemy Games
Original date: September 16, 2016
Source thread: https://forums.rpgmakerweb.com/threads/cannot-remove-property-removeagro-of-undefined.68402/
Source forum path: Game Development Engines > Legacy Engine Support > RPG Maker MV Support

Summary

Hey all, So, I have encountered a problem that crashes the game when a user goes to save a game. Any time they select a save file slot and click save the error "Cannot Remove Property 'removeAgro' of undefined" appears. I have events that "autosave" which still seem to work and will save over slot one. Manual saving seems to break everything. Also if i try manual saving over slot 1 (the autosave 1) the next time I try to load the game i get a...

Archived First Post

Hey all,

So, I have encountered a problem that crashes the game when a user goes to save a game. Any time they select a save file slot and click save the error "Cannot Remove Property 'removeAgro' of undefined" appears. I have events that "autosave" which still seem to work and will save over slot one. Manual saving seems to break everything. Also if i try manual saving over slot 1 (the autosave 1) the next time I try to load the game i get a new error "undefined is not a function" If I disable YEP_SaveCore then the save file works again and I can autosave.

Steps I am taking:

Event Autosaves on saveslot 1 (autosave continues to work)
Player accesses the menu to save game - selecting any save slot (excluding save slot 1) causes the game to crash with error "Cannot Remove Property 'removeAgro' of undefined." The save file can still be loaded.
Player accesses the menu to save game - selecting save slot 1 causes the game to crash with error Cannot Remove Property 'removeAgro' of undefined. The save file will not load with error: "undefined is not a function"
Disabling the YEP_SaveCore plugin fixed the "undefined is not a function" error

I am using Yanfly YEP_Savecore along with several other Yanfly plugins and Quasi plugins for ABS. (See images elderine1+2)
I have tried disabling plugins but still seem to have the same issue.
I have tried the debug console to get more information but now it seems to be broken too :S I get "detached from the target" error (see elderine3.png)

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#039 #rpg-maker-archive #mv-support

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