diff --git a/build.gradle b/build.gradle
index d56dc1d..fec1434 100644
--- a/build.gradle
+++ b/build.gradle
@@ -16,7 +16,7 @@ repositories {
     jcenter()
 }
 
-version = '1.1.1'
+version = '1.1.2'
 
 // coveralls plugin depends on xml format report
 
diff --git a/src/main/java/com/invoiced/entity/Customer.java b/src/main/java/com/invoiced/entity/Customer.java
index e180b43..e957bd2 100644
--- a/src/main/java/com/invoiced/entity/Customer.java
+++ b/src/main/java/com/invoiced/entity/Customer.java
@@ -203,7 +203,7 @@ public Invoice invoice() throws EntityException {
 
 		try {
 
-			String response = this.getConnection().post(url, null, "");
+			String response = this.getConnection().post(url, null, "{}");
 
 			invoice = Util.getMapper().readValue(response, Invoice.class);
 			invoice.setConnection(this.getConnection());