ndk null 에러 관련 질문 드립니다.. 부탁 드립니다..

Question

//ndk null 에러난거 같은데 코드 첨부 합니다. 어디 부분이 잘못된지 알려주세요.ㅠㅠ


JNIEXPORT jint JNI_OnLoad(JavaVM *vm, void *reserved) {
    g_vm = vm;
    return JNI_VERSION_1_6;
}
//==============================================================================

typedef struct _TJNI_HANDLE {
    jobject obj;
} TJNI_HANDLE, *PTJNI_HANDLE;
void callbackStream(int nFD, unsigned char unPLPId, unsigned char *pALPData, int nLength, void *pUserData) {

    // Add
    if(pUserData == nullptr) {
        return;
    }

    PTJNI_HANDLE handle = (PTJNI_HANDLE) pUserData;
    jobject obj = handle->obj;

    // Add
    if(obj == nullptr) {
        return;
    }


    JNIEnv *env;
    int nEnvStat;

    nEnvStat = g_vm->GetEnv((void **) &env, JNI_VERSION_1_6);

    if (unPLPId == GHOST_CALLBACK_START) {
        if (nEnvStat == JNI_EDETACHED) {
            g_vm->AttachCurrentThread(&env, nullptr);
        } else if (nEnvStat == JNI_OK) {
            // Success. do nothing.
        } else {
            // error.
            return;
        }

        if (nLength <= 0) {
            return;
        }

        jclass cls = env->GetObjectClass(obj);
        jmethodID mid = env->GetMethodID(cls, "callbackStream", "(IB[B)V");

        if (mid == nullptr) {
            env->DeleteLocalRef(cls);
            return;
        }

        jbyteArray jbyteArrayData = env->NewByteArray(nLength);
        if(jbyteArrayData == nullptr){
            env->DeleteLocalRef(cls);
            return;
        }
        jbyte *jbyteData = env->GetByteArrayElements(jbyteArrayData, nullptr);
        memcpy(jbyteData, pALPData, nLength);
        env->ReleaseByteArrayElements(jbyteArrayData, jbyteData, 0);

        env->CallVoidMethod(obj, mid, nFD, unPLPId, jbyteArrayData);

        env->DeleteLocalRef(jbyteArrayData);
        env->DeleteLocalRef(cls);
    }
    else if (unPLPId == GHOST_CALLBACK_STOP) {
        if (nEnvStat == JNI_OK) {
            g_vm->DetachCurrentThread();
        }
    }
}
extern "C" jint Java_com_onpoom_uhdreceiverandroid_UHDSignal_AtbisAtsc3Jni_init(JNIEnv *env, jobject obj, jint fd) {
    PTJNI_HANDLE handle = new TJNI_HANDLE;
    handle->obj = env->NewGlobalRef(obj);

    jint result = GhostInit(fd, callbackStream, handle);
    if (result < 0) {
        delete handle;
    }

    return result;
}
 //에러 코드가 길어서 핵심 부분은 

2019-11-01 00:44:39.293 3791-3791/? A/DEBUG: pid: 1492, tid: 3726, name: pool-801-thread  >>> com.onpoom.uhdreceiverandroid <<<
2019-11-01 00:44:39.293 3791-3791/? A/DEBUG: signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
2019-11-01 00:44:39.295 3791-3791/? A/DEBUG: Abort message: 'art/runtime/java_vm_ext.cc:470] JNI DETECTED ERROR IN APPLICATION: field operation on NULL object: 0x0'