OdinPlus_and_Marketplace_compatibility

Compatibility patch by BlackViking / Forteca

A lightweight standalone BepInEx compatibility plugin for OdinPlus and Marketplace And Server NPCs Revamped.

It prevents the NullReferenceException that can occur when Marketplace's Harmony patch for PieceTable.UpdateAvailable is triggered while OdinPlus initializes its custom Blueprint Tool PieceTable.

The goal is simple: keep both original mods installed, keep their files untouched, and fix only the compatibility conflict between them.

What it fixes

When both mods are installed, Marketplace's PieceTable.UpdateAvailable postfix can be invoked during OdinPlus Blueprint Tool initialization. In the affected setup this can cause:

NullReferenceException
Marketplace.Hammer.MarketplaceHammer+PieceTable_UpdateAvailable_Patch.Postfix
OdinPlus.OdinItem.InitBlueprintTool

This plugin adds a narrow safety guard around that specific initialization conflict. Normal Marketplace PieceTable processing continues through the original Marketplace logic unchanged.

What it keeps intact

• Original OdinPlus DLL remains unchanged.
• Original Marketplace DLL remains unchanged.
• Marketplace NPC systems remain available.
• Marketplace shops, traders, hammer functionality, zones and normal systems remain available.
• OdinPlus villages, NPC systems, quests, factions and Blueprint Tool remain available.
• No original mod code is redistributed or embedded in this compatibility plugin.
• No PowerShell scripts or manual DLL replacement are required.

What it does NOT do

• It does not replace kg.Marketplace.dll.
• It does not replace OdinPlus.dll.
• It does not disable Marketplace.
• It does not disable OdinPlus.
• It does not modify your worlds, characters, NPC data, blueprints or configuration files.

Installation

Install the original versions of OdinPlus and Marketplace And Server NPCs Revamped normally.

Then place:

OdinPlus_and_Marketplace_compatibility.dll

inside:

BepInEx/plugins/

Typical manual layout:

BepInEx/plugins/
  OdinPlus.dll
  kg.Marketplace.dll
  OdinPlus_and_Marketplace_compatibility.dll

That's it. No DLL replacement and no manual patching are required.

Tested with

• Valheim: 0.221.12
• BepInExPack Valheim: 5.4.2333
• OdinPlus: 0.2.6
• Marketplace And Server NPCs Revamped: 9.8.8

Runtime verification

The standalone compatibility plugin has been tested through game startup and world entry with both target mods enabled.

Successful activation is reported in the BepInEx log as:

[OdinMarketCompat] guard active (Marketplace + OdinPlus).

The tested runtime completed without the previous MarketplaceHammer NullReferenceException.

Updating Marketplace / OdinPlus

This release is built and tested for the versions listed above.

After updating either dependency, check BepInEx/LogOutput.log or Player.log. If the expected Marketplace compatibility target changes or no longer exists, an updated release of this plugin may be required.

The compatibility plugin is designed to fail safely rather than intentionally patch unrelated Marketplace code.

Troubleshooting

If the plugin loads but the guard cannot be activated, check the BepInEx log for messages containing:

OdinMarketCompat
Marketplace
OdinPlus
Exception

For support, include the relevant Player.log or LogOutput.log lines.

Uninstall

Simply remove:

OdinPlus_and_Marketplace_compatibility.dll

The original OdinPlus and Marketplace installations remain untouched.

Credits

Created by BlackViking / Forteca.

This is an independent compatibility patch. All rights, names and assets belonging to the original OdinPlus and Marketplace And Server NPCs Revamped projects remain with their respective authors.

Contact

Forteca: https://forteca.net
Discord: https://discord.gg/forteca
Email: forteca.box@gmail.com

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