diff --git a/lib/class-model.js b/lib/class-model.js
index bfe843c..c06230c 100644
--- a/lib/class-model.js
+++ b/lib/class-model.js
@@ -1343,7 +1343,7 @@ function compileModule (env) {
   const field = env.javaLangReflectField();
   let j = javaApi;
   [
-    jvmti,
+    jvmti !== null ? jvmti : ptr(0),
     getDeclaredMethods, getDeclaredFields,
     method.getName, method.getModifiers,
     field.getName, field.getModifiers