diff --git a/src/main/java/re/imc/geysermodelenginepackgenerator/ExtensionMain.java b/src/main/java/re/imc/geysermodelenginepackgenerator/ExtensionMain.java
index 02c80c8..05a808e 100644
--- a/src/main/java/re/imc/geysermodelenginepackgenerator/ExtensionMain.java
+++ b/src/main/java/re/imc/geysermodelenginepackgenerator/ExtensionMain.java
@@ -47,6 +47,9 @@ public class ExtensionMain implements Extension {
              GeyserUtils.addCustomEntity(id);
 
              Geometry geometry = GeneratorMain.geometryMap.get(entity);
+             if (geometry == null) {
+                 continue;
+             }
              geometry.getBones().forEach(bone -> {
                  GeyserUtils.addProperty(id, entity + ":" + bone, Boolean.class);
              });