fixed bugs, memory leaks, etc

src/main/java/dev/zprestige/prestige/mixin/HeldItemRendererMixin.java

@@ -19,7 +19,7 @@ public abstract class HeldItemRendererMixin {
         cancellable = true
     )
     private void postSwingArmEventAtHead(float swingProgress, MatrixStack matrixStack, int i, Arm arm, InjectionCallback ci) {
-        if (HookBridge.hasSwingArmListeners(Prestige.eventBus, SwingArmEvent.class)) {
+        if (Prestige.eventBus != null && HookBridge.hasSwingArmListeners(Prestige.eventBus, SwingArmEvent.class)) {
             SwingArmEvent event = HookBridge.createSwingArmEvent(matrixStack, arm, swingProgress, 1.0F);
             if (HookBridge.postSwingArmEvent(event)) {
                 matrixStack.scale(2.0F, 2.0F, 2.0F);