#vulnerable code 
                                public synchronized void release(@NotNull CommonStore store) {
        store.release();

        long refCount = store.refCount();
        assert refCount >= 0;
        if (refCount == 0) {
            for (Map.Entry<RollDetails, WeakReference<WireStore>> entry : stores.entrySet()) {
                WeakReference<WireStore> ref = entry.getValue();
                if (ref != null && ref.get() == store) {
                    stores.remove(entry.getKey());
                    storeFileListener.onReleased(entry.getKey().cycle(), store.file());
                    return;
                }
            }
            LOGGER.warn("Store was not registered {}", store.file().getName());
        }
    } 
                            #location 15 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public synchronized void release(@NotNull CommonStore store) {
        store.release();

        long refCount = store.refCount();
        assert refCount >= 0;
        if (refCount == 0) {
            for (Map.Entry<RollDetails, WeakReference<WireStore>> entry : stores.entrySet()) {
                WeakReference<WireStore> ref = entry.getValue();
                if (ref != null && ref.get() == store) {
                    stores.remove(entry.getKey());
                    storeFileListener.onReleased(entry.getKey().cycle(), store.file());
                    return;
                }
            }
            if (Jvm.debug().isEnabled(getClass()))
                Jvm.debug().on(getClass(), "Store was not registered: " + store.file());
        }
    }