diff --git a/build_num b/build_num
index 675df142f..60e8ada27 100644
--- a/build_num
+++ b/build_num
@@ -1 +1 @@
-#define BUILD_NUM 3289
+#define BUILD_NUM 3290
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 0c227bd87..e2a0627bb 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,9 @@
+2010-09-30  Vadim Kurland  <vadim@vk.crocodile.org>
+
+	* utils.cpp (validateName): fixed #1751 "Don't allow interface
+	names to be blank". The GUI should not allow the name of any
+	object to be blank.
+
 2010-09-29  Vadim Kurland  <vadim@vk.crocodile.org>
 
 	* ProjectPanel.cpp (ProjectPanel::inspect): fixed #1718 "Inspect
diff --git a/src/gui/utils.cpp b/src/gui/utils.cpp
index 1e33ef42e..fd438f2e3 100644
--- a/src/gui/utils.cpp
+++ b/src/gui/utils.cpp
@@ -225,6 +225,23 @@ bool isTreeReadWrite(QWidget *parent, FWObject *obj)
  */
 bool validateName(QWidget *parent, FWObject *obj, const QString &newname)
 {
+    if (newname.isEmpty())
+    {
+        // show warning dialog only if app has focus
+        if (QApplication::focusWidget() != NULL)
+        {
+            parent->blockSignals(true);
+            
+            QMessageBox::warning(
+                parent, "Firewall Builder",
+                QObject::tr("Object name should not be blank"),
+                QObject::tr("&Continue"), NULL, NULL, 0, 2 );
+                
+            parent->blockSignals(false);
+        }
+        return false;
+    }
+
     FWObject *p = obj->getParent();
     for (FWObject::iterator i=p->begin(); i!=p->end(); ++i)
     {