news · 2026-10-27

CT Quest System v1.0.21 Released – Critical Crash Fix & Stability Improvements

CT Quest System v1.0.21 is now available for RPG Maker MZ! This update fixes a critical crash caused by the Erase Event command, improves NPC quest marker handling, and strengthens event stability. Download the latest patch today.

CT Quest System v1.0.21 RPG Maker MZ plugin update featuring a critical Erase Event crash fix and NPC quest marker stability improvements by Cynthia Tools.

# CT Quest System v1.0.21 – Critical Bug Fix & Stability Update

Release Date: October 28, 2026

Plugin: CT Quest System

Version: 1.0.21

Compatibility: RPG Maker MZ

Developer: Cynthia Tools

We're pleased to announce the release of CT Quest System v1.0.21, an important maintenance update addressing a critical crash reported by a member of our community.

This release focuses on improving stability, strengthening event handling, and ensuring smoother compatibility with RPG Maker MZ's built-in event system.

🐛 Critical Bug Fixed – Erase Event Crash

A critical issue was discovered where using RPG Maker MZ's built-in Erase Event command could cause the game to crash while CT Quest System was enabled.

The issue could occur even when the affected event did not contain any quest-related commands.

Reported Error:

`TypeError: Cannot read property 'list' of undefined`

What Caused the Problem?

The issue originated from how the plugin's NPC quest marker system checked event command lists.

When an event was erased or had no active event page, the plugin could attempt to access event data that was no longer available, resulting in a crash.

How We Fixed It

In v1.0.21, we've improved the event-scanning and quest-marker handling systems to prevent this issue.

Added validation before accessing active event pages.
Prevented erased or inactive events from being scanned.
Improved quest marker visibility when an event is erased.
Strengthened event-page transition handling.
Preserved existing quest interactions and tracking functionality.

These changes address the reported crash without requiring users to modify their existing quest configurations.

✅ Testing & Stability

The update successfully passed 15 targeted regression tests with 33 assertions, including tests for erased events, inactive event pages, NPC quest markers, and event-page transitions.

Existing quest data and save formats remain compatible with the updated plugin.

Full in-engine testing is still recommended for individual RPG Maker MZ projects.

📦 How to Update to v1.0.21

Updating is straightforward:

Download the latest version of CT Quest System.
Replace the previous plugin JavaScript file in your project's `js/plugins/` directory.
Keep your existing `CT_QuestSystem.json` file and quest configurations.
Launch your RPG Maker MZ project and continue developing.

No quest database migration is required.

❤️ Special Thanks to Our Community

We would like to extend a special thank-you to noname1848 from itch.io for reporting this critical bug and providing detailed, step-by-step instructions to reproduce it.

Your report helped us identify the underlying issue and develop a targeted fix.

Community feedback plays an important role in improving Cynthia Tools products. Every bug report, suggestion, and feature request helps us build more reliable tools for RPG Maker developers.

Thank you for helping us make CT Quest System better for everyone!