diff --git a/src/Model/BlogCategory.php b/src/Model/BlogCategory.php
index ae69c7d..94590a3 100644
--- a/src/Model/BlogCategory.php
+++ b/src/Model/BlogCategory.php
@@ -27,6 +27,8 @@ class BlogCategory extends DataObject implements CategorisationObject
      */
     const DUPLICATE_EXCEPTION = 'DUPLICATE';
 
+    const EMPTY_TITLE_EXCEPTION = 'EMPTY_TITLE';
+
     /**
      * {@inheritDoc}
      * @var string
diff --git a/src/Model/BlogObject.php b/src/Model/BlogObject.php
index d067fb3..93b127c 100644
--- a/src/Model/BlogObject.php
+++ b/src/Model/BlogObject.php
@@ -72,6 +72,10 @@ trait BlogObject
             $validation->addError($this->getDuplicateError(), self::DUPLICATE_EXCEPTION);
         }
 
+        if(empty($this->Title)) {
+            $validation->addError($this->getEmptyTitleError(), self::EMPTY_TITLE_EXCEPTION);
+        }
+
         return $validation;
     }
 
@@ -244,4 +248,14 @@ trait BlogObject
      * @return string
      */
     abstract protected function getDuplicateError();
+
+    /**
+     * Returns an error message for this object when it tries to write with an empty title.
+     *
+     * @return string
+     */
+    protected function getEmptyTitleError()
+    {
+        return _t(__CLASS__ . '.EmptyTitle', 'Title must not be empty');
+    }
 }
diff --git a/src/Model/BlogTag.php b/src/Model/BlogTag.php
index 4180f67..66bf3fb 100644
--- a/src/Model/BlogTag.php
+++ b/src/Model/BlogTag.php
@@ -27,6 +27,8 @@ class BlogTag extends DataObject implements CategorisationObject
      */
     const DUPLICATE_EXCEPTION = 'DUPLICATE';
 
+    const EMPTY_TITLE_EXCEPTION = 'EMPTY_TITLE';
+
     /**
      * {@inheritDoc}
      * @var string
diff --git a/tests/php/BlogCategoryTest.php b/tests/php/BlogCategoryTest.php
index c189e32..50bfd09 100755
--- a/tests/php/BlogCategoryTest.php
+++ b/tests/php/BlogCategoryTest.php
@@ -167,4 +167,23 @@ class BlogCategoryTest extends FunctionalTest
             $this->assertEquals(BlogTag::DUPLICATE_EXCEPTION, $messages[0]['messageType']);
         }
     }
+
+    public function testEmptyTitle()
+    {
+        $blog = $this->objFromFixture(Blog::class, 'FirstBlog');
+
+        $category = new BlogCategory();
+        $category->Title = '';
+        $category->BlogID = $blog->ID;
+        $category->URLSegment = 'test';
+
+        try {
+            $category->write();
+            $this->fail('BlogCategory with empty title is written');
+        } catch (ValidationException $e) {
+            $messages = $e->getResult()->getMessages();
+            $this->assertCount(1, $messages);
+            $this->assertEquals(BlogCategory::EMPTY_TITLE_EXCEPTION, $messages[0]['messageType']);
+        }
+    }
 }
diff --git a/tests/php/BlogTagTest.php b/tests/php/BlogTagTest.php
index 754b338..28ef254 100755
--- a/tests/php/BlogTagTest.php
+++ b/tests/php/BlogTagTest.php
@@ -195,4 +195,23 @@ class BlogTagTest extends FunctionalTest
         $tag->write();
         $this->assertEquals($tag->URLSegment, "another-test");
     }
+
+    public function testEmptyTitle()
+    {
+        $blog = $this->objFromFixture(Blog::class, 'FirstBlog');
+
+        $tag = new BlogTag();
+        $tag->Title = '';
+        $tag->BlogID = $blog->ID;
+        $tag->URLSegment = 'test';
+
+        try {
+            $tag->write();
+            $this->fail('BlogTag with empty title is written');
+        } catch (ValidationException $e) {
+            $messages = $e->getResult()->getMessages();
+            $this->assertCount(1, $messages);
+            $this->assertEquals(BlogTag::EMPTY_TITLE_EXCEPTION, $messages[0]['messageType']);
+        }
+    }
 }