1 files changed, 9 insertions, 3 deletions
diff --git a/Bugzilla/WebService/Util.pm b/Bugzilla/WebService/Util.pm
index 26a6ebbb0..a879c0e0d 100644
--- a/Bugzilla/WebService/Util.pm
+++ b/Bugzilla/WebService/Util.pm
@@ -16,6 +16,7 @@ use Bugzilla::FlagType;
 use Bugzilla::Error;
 
 use Storable qw(dclone);
+use List::MoreUtils qw(any none);
 
 use parent qw(Exporter);
 
@@ -220,14 +221,19 @@ sub validate  {
     # $params should be.
     return ($self, undef) if (defined $params and !ref $params);
 
+    my @id_params = qw(ids comment_ids);
     # If @keys is not empty then we convert any named 
     # parameters that have scalar values to arrayrefs
     # that match.
     foreach my $key (@keys) {
         if (exists $params->{$key}) {
-            $params->{$key} = ref $params->{$key} 
-                              ? $params->{$key} 
-                              : [ $params->{$key} ];
+            $params->{$key} = [ $params->{$key} ] unless ref $params->{$key};
+
+            if (any { $key eq $_ } @id_params) {
+                my $ids = $params->{$key};
+                ThrowCodeError('param_scalar_array_required', { param => $key })
+                  unless ref($ids) eq 'ARRAY' && none { ref $_ } @$ids;
+            }
         }
     }