diff --git a/src/main/java/org/gcube/portlets/user/td/csvimportwidget/client/FileUploadPanel.java b/src/main/java/org/gcube/portlets/user/td/csvimportwidget/client/FileUploadPanel.java
index 8842eee..0175344 100644
--- a/src/main/java/org/gcube/portlets/user/td/csvimportwidget/client/FileUploadPanel.java
+++ b/src/main/java/org/gcube/portlets/user/td/csvimportwidget/client/FileUploadPanel.java
@@ -96,6 +96,9 @@ public class FileUploadPanel extends FormPanel {
 				uploadButton.setEnabled(fileUploadField.isValid());
 				String path = fileUploadField.getValue();
 				int punto = path.lastIndexOf(".");
+				if(punto<0){
+					punto=path.length();
+				}
 				int slash = path.lastIndexOf("/");
 				int backslash = path.lastIndexOf("\\");
 				String filename="";