diff --git a/mozilla/webtools/bugzilla/.bzrrev b/mozilla/webtools/bugzilla/.bzrrev
index 14be082f093..35a342e91b6 100644
--- a/mozilla/webtools/bugzilla/.bzrrev
+++ b/mozilla/webtools/bugzilla/.bzrrev
@@ -1 +1 @@
-7713
\ No newline at end of file
+7714
\ No newline at end of file
diff --git a/mozilla/webtools/bugzilla/Bugzilla/WebService/Bug.pm b/mozilla/webtools/bugzilla/Bugzilla/WebService/Bug.pm
index 124dd6b258b..86c6ef5dadc 100644
--- a/mozilla/webtools/bugzilla/Bugzilla/WebService/Bug.pm
+++ b/mozilla/webtools/bugzilla/Bugzilla/WebService/Bug.pm
@@ -569,6 +569,10 @@ sub create {
 
 sub legal_values {
     my ($self, $params) = @_;
+
+    defined $params->{field} 
+        or ThrowCodeError('param_required', { param => 'field' });
+
     my $field = Bugzilla::Bug::FIELD_MAP->{$params->{field}} 
                 || $params->{field};