From 863677216c786c251ef7f8de3a09f56be6845216 Mon Sep 17 00:00:00 2001
From: Anton Domnikov <anton.domnikov@touchin.ru>
Date: Fri, 15 Apr 2016 18:11:11 +0300
Subject: [PATCH] add null object support

---
 .../roboswag/components/storables/JsonPreferenceStorable.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/java/ru/touchin/roboswag/components/storables/JsonPreferenceStorable.java b/src/main/java/ru/touchin/roboswag/components/storables/JsonPreferenceStorable.java
index 0624add..03acfd9 100644
--- a/src/main/java/ru/touchin/roboswag/components/storables/JsonPreferenceStorable.java
+++ b/src/main/java/ru/touchin/roboswag/components/storables/JsonPreferenceStorable.java
@@ -61,6 +61,10 @@ public class JsonPreferenceStorable<T> extends Storable<String, T, String> {
                                     @NonNull final Class<String> stringClass,
                                     @Nullable final T object)
                 throws ConversionException {
+            if (object == null) {
+                return null;
+            }
+
             final StringWriter stringWriter = new StringWriter();
             JsonGenerator generator = null;
             try {