diff --git a/pom.xml b/pom.xml
index 3559ea0..2d9e222 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.myzlab</groupId>
     <artifactId>K</artifactId>
-    <version>1.1.15.1</version>
+    <version>1.1.18</version>
     <packaging>jar</packaging>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
diff --git a/src/main/java/ve/zlab/k/KCollection.java b/src/main/java/ve/zlab/k/KCollection.java
index 3647225..e2578e5 100644
--- a/src/main/java/ve/zlab/k/KCollection.java
+++ b/src/main/java/ve/zlab/k/KCollection.java
@@ -8,6 +8,7 @@
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
@@ -884,6 +885,10 @@ public KCollection addProperty(final String property, final Object value) throws
         return this;
     }
     
+    public Iterator<KRow> iterator() {
+        return collection.iterator();
+    }
+    
     public <T, V> Map<T, V> twoColumnsToMap(final String key, final String value, final Class<T> clazzT, final Class<V> clazzV) throws KException {
         final Map<T, V> map = new HashMap<>();
         
diff --git a/src/main/java/ve/zlab/k/KRow.java b/src/main/java/ve/zlab/k/KRow.java
index 1fa5bb8..9671d2d 100644
--- a/src/main/java/ve/zlab/k/KRow.java
+++ b/src/main/java/ve/zlab/k/KRow.java
@@ -161,6 +161,14 @@ public UUID getUUID(final int n) {
             return null;
         }
         
+        if (o[n] == null) {
+            return null;
+        }
+        
+        if (o[n] instanceof String) {
+            return UUID.fromString((String) o[n]);
+        }
+        
         return (UUID) o[n];
     }
     
diff --git a/src/main/java/ve/zlab/k/response/DynamicObject.java b/src/main/java/ve/zlab/k/response/DynamicObject.java
index 1edce8f..3bcc9c2 100644
--- a/src/main/java/ve/zlab/k/response/DynamicObject.java
+++ b/src/main/java/ve/zlab/k/response/DynamicObject.java
@@ -136,7 +136,11 @@ public DynamicObject addProperties(final Map<String, ?> map) {
     }
     
     public Response toResponse() {
-        return Response.ok(this.toJSON()).build();
+        return toResponse(Response.Status.OK);
+    }
+    
+    public Response toResponse(Response.Status status) {
+        return Response.status(status).entity(this.toJSON()).build();
     }
     
     public String toJSON() {