diff --git a/build.gradle b/build.gradle
index b526801..2b1f8ec 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ plugins {
 }
 
 group 'no.datek'
-version '0.13.2'
+version '0.13.3'
 final String JRUBY_VERSION = '9.4.5.0';
 
 repositories {
diff --git a/src/main/resources/ruby/form_helper.rb b/src/main/resources/ruby/form_helper.rb
index 5a931ad..a85164c 100644
--- a/src/main/resources/ruby/form_helper.rb
+++ b/src/main/resources/ruby/form_helper.rb
@@ -273,9 +273,9 @@ def select_input(object, field_name, option_map = [], **opts)
     end
     html << ">"
 
-    field_value = selected || object_field_value(object, field_name)
+    field_value = selected&.to_s&.strip || object_field_value(object, field_name)
 
-    if field_value.empty? && prompt
+    if field_value.blank? && prompt
       html << %{<option value="">#{TrueClass === prompt ? "(#{message['text.none']})" : CGI.escapeHTML(prompt.to_s)}</option>}
     end