diff --git a/runbot/models/build_error.py b/runbot/models/build_error.py
index 394e6f17..e0e492b6 100644
--- a/runbot/models/build_error.py
+++ b/runbot/models/build_error.py
@@ -106,7 +106,7 @@ class BuildError(models.Model):
     def _compute_error_history_ids(self):
         for error in self:
             fingerprints = [error.fingerprint] + [rec.fingerprint for rec in error.child_ids]
-            error.error_history_ids = self.search([('fingerprint', 'in', fingerprints), ('active', '=', False), ('id', '!=', error.id)])
+            error.error_history_ids = self.search([('fingerprint', 'in', fingerprints), ('active', '=', False), ('id', '!=', error.id or False)])
 
     @api.model
     def _digest(self, s):
diff --git a/runbot/views/build_error_views.xml b/runbot/views/build_error_views.xml
index 3684d81d..f7e77c7d 100644
--- a/runbot/views/build_error_views.xml
+++ b/runbot/views/build_error_views.xml
@@ -9,7 +9,7 @@
             </header>
             <sheet>
               <group name="build_error_group">
-                <field name="fingerprint"/>
+                <field name="fingerprint" readonly="1"/>
                 <field name="content"/>
                 <field name="cleaned_content" groups="base.group_no_one"/>
                 <field name="module_name"/>