diff --git a/wagtail_advanced_form_builder/blocks/fields/multi_line_field_block.py b/wagtail_advanced_form_builder/blocks/fields/multi_line_field_block.py
index 6e11d4a..fb47bfe 100644
--- a/wagtail_advanced_form_builder/blocks/fields/multi_line_field_block.py
+++ b/wagtail_advanced_form_builder/blocks/fields/multi_line_field_block.py
@@ -20,5 +20,5 @@ class MultiLineFieldBlock(BaseFieldBlock):
     placeholder = None
 
     class Meta:
-        form_classname = "waf--field"
+        form_classname = "waf--field form-control"
         icon = "extraicons--text-box"
diff --git a/wagtail_advanced_form_builder/templates/wagtail_advanced_form_builder/form/form_builder.html b/wagtail_advanced_form_builder/templates/wagtail_advanced_form_builder/form/form_builder.html
index dc7769a..dbd53f3 100644
--- a/wagtail_advanced_form_builder/templates/wagtail_advanced_form_builder/form/form_builder.html
+++ b/wagtail_advanced_form_builder/templates/wagtail_advanced_form_builder/form/form_builder.html
@@ -1,7 +1,9 @@
 {% include "wagtail_advanced_form_builder/form/no_script_notification.html" %}
 
 <script>
-    window.wafFormConditions = {{ conditional_rules|safe }};
+    {% if conditional_rules %}
+        window.wafFormConditions = {{ conditional_rules|safe }};
+    {% endif %)
     {% if stop_conditions %}
         window.wafStopConditions = {{ stop_conditions|safe }};
     {% endif %}