diff --git a/oaipmh-core/pom.xml b/oaipmh-core/pom.xml
index 9d269860528af98fb7252c532f21a93bc495fe28..f928af2d369df5f830dab4f3d00972e016a5b314 100644
--- a/oaipmh-core/pom.xml
+++ b/oaipmh-core/pom.xml
@@ -4,11 +4,11 @@
 	<parent>
 		<artifactId>oaipmh</artifactId>
 		<groupId>info.textgrid.middleware</groupId>
-		<version>1.3.17-SNAPSHOT</version>
+		<version>1.3.18-SNAPSHOT</version>
 	</parent>
 	<groupId>info.textgrid.middleware</groupId>
 	<artifactId>oaipmh-core</artifactId>
-	<version>1.3.17-SNAPSHOT</version>
+	<version>1.3.18-SNAPSHOT</version>
 	<packaging>jar</packaging>
 	<name>TextGrid :: TG-OAI-PMH :: Core</name>
 	<url>http://maven.apache.org</url>
diff --git a/oaipmh-core/src/main/java/info/textgrid/middleware/SetDeliverer.java b/oaipmh-core/src/main/java/info/textgrid/middleware/SetDeliverer.java
index 50421f73fc88a964aa92ec259eac5e217dac614d..c232e4f9dcaf85f6a8b99e7a4f8f9e12a73896da 100644
--- a/oaipmh-core/src/main/java/info/textgrid/middleware/SetDeliverer.java
+++ b/oaipmh-core/src/main/java/info/textgrid/middleware/SetDeliverer.java
@@ -95,7 +95,7 @@ public class SetDeliverer {
 
 			setList.getSet().add(set);
 		}
-
+		identifier.clear();
 		return setList;
 
 	}
diff --git a/oaipmh-webapp/pom.xml b/oaipmh-webapp/pom.xml
index ee3655cc0a53403fd723092128c29821fb1d3584..8e1a13c497acf13ed704b4cdf7cb965747859613 100644
--- a/oaipmh-webapp/pom.xml
+++ b/oaipmh-webapp/pom.xml
@@ -4,12 +4,12 @@
 	<parent>
 		<artifactId>oaipmh</artifactId>
 		<groupId>info.textgrid.middleware</groupId>
-		<version>1.3.17-SNAPSHOT</version>
+		<version>1.3.18-SNAPSHOT</version>
 	</parent>
 	<groupId>info.textgrid.middleware</groupId>
 	<artifactId>oaipmh-webapp</artifactId>
 	<packaging>war</packaging>
-	<version>1.3.17-SNAPSHOT</version>
+	<version>1.3.18-SNAPSHOT</version>
 	<name>TextGrid :: OAI-PMH :: Webapp</name>
 	<url>http://maven.apache.org</url>
 	<profiles>
diff --git a/pom.xml b/pom.xml
index 7def669ee7129b1f07b2a86ccec643e3eefe85c1..75c8de2c641463cc1b8f9bad56df43467688946e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>info.textgrid.middleware</groupId>
   <artifactId>oaipmh</artifactId>
-  <version>1.3.17-SNAPSHOT</version>
+  <version>1.3.18-SNAPSHOT</version>
   <packaging>pom</packaging>
   <name>TextGrid :: TG-OAI-PMH :: Parent</name>
   <properties>