# NullReferenceException (Shooter 2)

If you encounter a **NullReferenceException** similar to the following after changing a part, preset, color, or bodyshape of your character:

**Error:**\
NullReferenceException (GameCreator.Runtime.Shooter.RigShooterHuman.UpdateFK)

#### Cause

**HeroBridge** works with **Sidekick’s Runtime API**, and under the hood it also relies on **Game Creator 2’s API,** specifically the **Change Model** method.\
Whenever you modify a **part**, **color**, **preset**, or **bodyshape**, HeroBridge triggers a model change using Game Creator’s Change Model method.

However, in **Shooter 2**, changing the character’s model while a weapon is equipped cause the **RigShooterHuman** system to lose its references, resulting in the NullReferenceException error.

{% hint style="info" %}
💡 **Tip:**

A workaround for this issue is to **store the currently equipped weapon and prop** in **local variables** on the character.

Then, use the **On Model Change** trigger to:

1. **Unequip** the weapon and prop.
2. **Wait one frame** (for the model change to complete).
3. **Re-equip** the weapon and prop using the stored local variables.

This ensures that the **Shooter 2 rig** properly reinitializes and restores all references after the model update.
{% endhint %}

A **bug report has been submitted** regarding this issue so it can be addressed in a future update of **Game Creator 2.**


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