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Errors when saving

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: Errors when saving
Original author: Papermaster
Original date: November 29, 2025
Source thread: https://forums.rpgmakerweb.com/threads/errors-when-saving.181230/
Source forum path: Game Development Engines > Legacy Engine Support > RPG Maker MV Support

Summary

Hello everyone. Ive been playtesting my game, but have run into an issue. When I attempt to save, I get the error: this._states.contains is not a function. When I try to open the console after this error, nothing pops up.

Archived First Post

Hello everyone.

Ive been playtesting my game, but have run into an issue. When I attempt to save, I get the error:
this._states.contains is not a function.
When I try to open the console after this error, nothing pops up.

After some reading around, I decided to play through my game from the start (i had gotten the error after jumping ahead through the story and attempting to save there). When I got to where I was and tried to save, I got a different error:
Cannot read property '1' of undefined.

I was using YEP_save core for my save files, and when I turned it off, I still got the same error. How do I resolve this so I can continue playtesting?

(images attached below)
View attachment 353910View attachment 353911

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