diff --git a/lib/docx/containers/text_run.rb b/lib/docx/containers/text_run.rb
index 59be9d3..1bc717f 100755
--- a/lib/docx/containers/text_run.rb
+++ b/lib/docx/containers/text_run.rb
@@ -95,7 +95,11 @@ def underlined?
         end
 
         def hyperlink?
-          @node.name == 'hyperlink'
+          @node.name == 'hyperlink' && external_link?
+        end
+
+        def external_link?
+          !@node.attributes['id'].nil?
         end
 
         def href
diff --git a/spec/docx/document_spec.rb b/spec/docx/document_spec.rb
index 28db70f..980327a 100755
--- a/spec/docx/document_spec.rb
+++ b/spec/docx/document_spec.rb
@@ -522,4 +522,13 @@
     end
   end
 
+  describe '#to_html' do
+    before do
+      @doc = Docx::Document.open(@fixtures_path + '/internal-links.docx')
+    end
+
+    it 'should not raise error' do
+      expect { @doc.to_html }.to_not raise_error
+    end
+  end
 end
diff --git a/spec/fixtures/internal-links.docx b/spec/fixtures/internal-links.docx
new file mode 100644
index 0000000..31a7153
Binary files /dev/null and b/spec/fixtures/internal-links.docx differ