diff --git a/src/main/java/org/gcube/common/storagehubwrapper/server/WorkspaceStorageHubClientService.java b/src/main/java/org/gcube/common/storagehubwrapper/server/WorkspaceStorageHubClientService.java
index 623c2be..b33f798 100644
--- a/src/main/java/org/gcube/common/storagehubwrapper/server/WorkspaceStorageHubClientService.java
+++ b/src/main/java/org/gcube/common/storagehubwrapper/server/WorkspaceStorageHubClientService.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.common.storagehubwrapper.server;
 
-import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
@@ -869,7 +868,7 @@ public final class WorkspaceStorageHubClientService implements Workspace{
 		try{
 
 			byte[] thumbBytes = storageHubClientService.getThumbnailData(itemId);
-			return new org.gcube.common.storagehubwrapper.shared.tohl.impl.StreamDescriptor(new ByteArrayInputStream(thumbBytes), null, new Long(thumbBytes.length));
+			return new org.gcube.common.storagehubwrapper.shared.tohl.impl.StreamDescriptor(WrapperUtility.toInputStream(thumbBytes), null, new Long(thumbBytes.length));
 
 		}catch(Exception e){
 			logger.error("Error on getThumbnailData for: "+itemId, e);
diff --git a/src/main/java/org/gcube/common/storagehubwrapper/server/WrapperUtility.java b/src/main/java/org/gcube/common/storagehubwrapper/server/WrapperUtility.java
new file mode 100644
index 0000000..2b5c5cc
--- /dev/null
+++ b/src/main/java/org/gcube/common/storagehubwrapper/server/WrapperUtility.java
@@ -0,0 +1,45 @@
+/**
+ *
+ */
+
+package org.gcube.common.storagehubwrapper.server;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it Oct 17, 2018
+ */
+public class WrapperUtility {
+
+
+	/**
+	 * To input stream.
+	 *
+	 * @param content the content
+	 * @return the input stream
+	 */
+	public static InputStream toInputStream(byte[] content) {
+
+		int size = content.length;
+		InputStream is = null;
+		byte[] b = new byte[size];
+		try {
+			is = new ByteArrayInputStream(content);
+			is.read(b);
+			return is;
+		}
+		catch (IOException e) {
+			return null;
+		}
+		finally {
+			try {
+				if (is != null)
+					is.close();
+			}
+			catch (Exception ex) {
+			}
+		}
+	}
+}