EventDataDeserializer.patch

diff --git a/src/main/java/com/stripe/model/EventDataDeserializer.java b/src/main/java/com/stripe/model/EventDataDeserializer.java
index 9489b98..f4106f4 100644
--- a/src/main/java/com/stripe/model/EventDataDeserializer.java
+++ b/src/main/java/com/stripe/model/EventDataDeserializer.java
@@ -99,7 +99,9 @@ public class EventDataDeserializer implements JsonDeserializer<EventData> {
            JsonElement element = entry.getValue();
            if("previous_attributes".equals(key)) {
                Map<String, Object> previousAttributes = new HashMap<String, Object>();
-               populateMapFromJSONObject(previousAttributes, element.getAsJsonObject());
+        if (element.getAsJsonObject() != null) {
+          populateMapFromJSONObject(previousAttributes, element.getAsJsonObject());
+        }
                eventData.setPreviousAttributes(previousAttributes);
            } else if ("object".equals(key)) {
                String type = element.getAsJsonObject().get("object").getAsString();