Crash "Pose stack not empty" caused by unguarded PoseStack push/pop in RenderCustomModel.renderItem()

[Krastik]

Description

Game crashes with java.lang.IllegalStateException: Pose stack not empty
during world rendering when an NPC using a Geckolib model holds an item.

Root cause

In RenderCustomModel.renderItem(), poseStack.pushPose() and
poseStack.popPose() are not exception-safe:

poseStack.pushPose();
... transforms ...
Minecraft.getInstance().getItemRenderer().renderStatic(stack, ...);
poseStack.popPose();

If renderStatic(...) throws for any reason (broken/unsupported item
render, etc.), popPose() is skipped, leaving the frame's PoseStack
unbalanced. Minecraft's own end-of-frame check in LevelRenderer then
throws "Pose stack not empty" and crashes the whole game — not just
the NPC render.

Suggested fix

Wrap the push/pop in try/finally so the stack is always balanced,
even if item rendering fails:

poseStack.pushPose();
try {
    ... transforms ...
    Minecraft.getInstance().getItemRenderer().renderStatic(stack, ...);
} catch (Throwable t) {
    // don't let one broken item crash the whole render frame
} finally {
    poseStack.popPose();
}

This has zero effect on the normal render path — it only prevents a
single failed item render from taking down the entire game.

Crash report

(прикрепи файл crash-2026-07-26_09.50.09-client.txt или вставь ключевую часть —
особенно стектрейс "IllegalStateException: Pose stack not empty" и Mod List)

Environment

• Minecraft 1.20.1, Forge 47.4.10

crashReport.txt

• CNPC-Gecko-Addon 1.20.1-1.0.6
• CustomNPCs GBPort Unofficial 1.20.1.20260227