Merge pull request 'v1.0.16' (#25) from dev into master

Reviewed-on: #25

pom.xml

@@ -11,7 +11,7 @@
 
 	<groupId>com.imyeyu.timiserverapi</groupId>
 	<artifactId>TimiServerAPI</artifactId>
-	<version>1.0.15</version>
+	<version>1.0.16</version>
 	<packaging>jar</packaging>
 	<name>TimiServerAPI</name>
 	<description>imyeyu.com API</description>

src/main/java/com/imyeyu/api/modules/gao/service/implement/GaoCustomerServiceImplement.java

@@ -377,7 +377,7 @@ public class GaoCustomerServiceImplement extends AbstractEntityService<GaoCustom
 	}
 
 	private void changeInvitedCount(String customerId, long delta) {
-		if (delta == 0) {
+		if (TimiJava.isEmpty(customerId) || delta == 0) {
 			return;
 		}
 		GaoCustomer customer = get(customerId);