diff --git a/runbot/models/branch.py b/runbot/models/branch.py
index 8d5b1099..41ada81b 100644
--- a/runbot/models/branch.py
+++ b/runbot/models/branch.py
@@ -113,6 +113,8 @@ class runbot_branch(models.Model):
                     if not _re_patch.match(pi['head']['label']):
                         # label is used to disambiguate PR with same branch name
                         branch.pull_head_name = pi['head']['label']
+            else:
+                branch.branch_name = ''
 
     @api.depends('branch_name')
     def _get_branch_url(self):
@@ -123,6 +125,8 @@ class runbot_branch(models.Model):
                     branch.branch_url = "https://%s/pull/%s" % (branch.repo_id.base, branch.branch_name)
                 else:
                     branch.branch_url = "https://%s/tree/%s" % (branch.repo_id.base, branch.branch_name)
+            else:
+                branch.branch_url = ''
 
     def _get_pull_info(self):
         self.ensure_one()
diff --git a/runbot/models/build.py b/runbot/models/build.py
index 7edd19a7..02dd77ed 100644
--- a/runbot/models/build.py
+++ b/runbot/models/build.py
@@ -332,7 +332,7 @@ class runbot_build(models.Model):
                 nickname = build.branch_id.name.split('/')[2]
                 nickname = re.sub(r'"|\'|~|\:', '', nickname)
                 nickname = re.sub(r'_|/|\.', '-', nickname)
-                build.dest = ("%05d-%s-%s" % (build.id, nickname[:32], build.name[:6])).lower()
+                build.dest = ("%05d-%s-%s" % (build.id or 0, nickname[:32], build.name[:6])).lower()
 
     @api.depends('repo_id', 'port', 'dest', 'host', 'duplicate_id.domain')
     def _compute_domain(self):
diff --git a/runbot/templates/frontend.xml b/runbot/templates/frontend.xml
index c7a29692..6cbb0e8e 100644
--- a/runbot/templates/frontend.xml
+++ b/runbot/templates/frontend.xml
@@ -62,9 +62,12 @@
         <t t-set="testing" t-value="hosts_data._total_testing()"/>
         <t t-set="workers" t-value="hosts_data._total_workers()"/>
         <t t-set="klass">success</t>
-        <t t-if="int(testing)/workers > 0"><t t-set="klass">info</t></t>
-        <t t-if="int(testing)/workers > 0.75"><t t-set="klass">warning</t></t>
-        <t t-if="int(testing)/workers >= 1"><t t-set="klass">danger</t></t>
+        <t t-if="not workers" t-set="klass">danger</t>
+        <t t-else="">
+          <t t-if="int(testing)/workers > 0" t-set="klass">info</t>
+          <t t-if="int(testing)/workers > 0.75" t-set="klass">warning</t>
+          <t t-if="int(testing)/workers >= 1" t-set="klass">danger</t>
+        </t>
         <span t-attf-class="label label-{{klass}}">Testing: <t t-esc="testing"/>/<t t-esc="workers"/></span>
       </template>