diff --git a/bakeup/templates/workshop/product_detail.html b/bakeup/templates/workshop/product_detail.html
index 7d60a9e..ac343e0 100644
--- a/bakeup/templates/workshop/product_detail.html
+++ b/bakeup/templates/workshop/product_detail.html
@@ -77,11 +77,11 @@ <h5>Kennzahlen</h5>
           </div>
         </div>
       </form>
-      {% if key_figures_form.dough_yield %}{% bootstrap_field key_figures_form.dough_yield size='sm' addon_before='TA' wrapper_class='' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-4' %}{% endif %}
-      {% if key_figures_form.salt %}{% bootstrap_field key_figures_form.salt size='sm' addon_after='%' wrapper_class='' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-4' %}{% endif %}
-      {% if key_figures_form.total_dough_weight %}{% bootstrap_field key_figures_form.total_dough_weight size='sm' addon_after='g' wrapper_class='' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-4' %}{% endif %}
-      {% if key_figures_form.wheat %}{% bootstrap_field key_figures_form.wheat size='sm' wrapper_class='resize-none' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-6' %}{% endif %}
-      {% if key_figures_form.pre_ferment %}{% bootstrap_field key_figures_form.pre_ferment size='sm' addon_after='%' wrapper_class='' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-4' %}{% endif %}
+      {% if key_figures_form.dough_yield and key_figures_form.dough_yield.value %}{% bootstrap_field key_figures_form.dough_yield size='sm' addon_before='TA' wrapper_class='' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-4' %}{% endif %}
+      {% if key_figures_form.salt and key_figures_form.salt.value %}{% bootstrap_field key_figures_form.salt size='sm' addon_after='%' wrapper_class='' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-4' %}{% endif %}
+      {% if key_figures_form.total_dough_weight and key_figures_form.total_dough_weight.value %}{% bootstrap_field key_figures_form.total_dough_weight size='sm' addon_after='g' wrapper_class='' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-4' %}{% endif %}
+      {% if key_figures_form.wheat and key_figures_form.wheat.value %}{% bootstrap_field key_figures_form.wheat size='sm' wrapper_class='resize-none' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-6' %}{% endif %}
+      {% if key_figures_form.pre_ferment and key_figures_form.pre_ferment.value %}{% bootstrap_field key_figures_form.pre_ferment size='sm' addon_after='%' wrapper_class='' layout='horizontal' horizontal_label_class='col-6' horizontal_field_class='col-4' %}{% endif %}
     </div>
   </div>
   {% endif %}
diff --git a/bakeup/workshop/templatetags/workshop_tags.py b/bakeup/workshop/templatetags/workshop_tags.py
index 2818363..4cbd11e 100644
--- a/bakeup/workshop/templatetags/workshop_tags.py
+++ b/bakeup/workshop/templatetags/workshop_tags.py
@@ -15,7 +15,7 @@ def baker_percentage(weight, flour_weight):
 
 @register.filter
 def clever_rounding(value):
-    if not value:
+    if value is None:
         return None
     if float(value) < 100:
         return floatformat(round(value, 1), -1)