diff --git a/lib/Pear/LocalLoop/Controller/Api/Categories.pm b/lib/Pear/LocalLoop/Controller/Api/Categories.pm
index 9569168..9913f42 100644
--- a/lib/Pear/LocalLoop/Controller/Api/Categories.pm
+++ b/lib/Pear/LocalLoop/Controller/Api/Categories.pm
@@ -55,7 +55,7 @@ sub post_category_list {
     $data->{essentials}->{$days}->{value} += $value;
   }
 
-  for my $day ( keys $data->{categories} ) {
+  for my $day ( keys %{ $data->{categories} } ) {
     $data->{categories}->{$day} = [ sort { $b->{value} <=> $a->{value} } @{ $data->{categories}->{$day} } ];
   }
 
diff --git a/lib/Pear/LocalLoop/Controller/Api/Upload.pm b/lib/Pear/LocalLoop/Controller/Api/Upload.pm
index 787be33..d1a0bd2 100644
--- a/lib/Pear/LocalLoop/Controller/Api/Upload.pm
+++ b/lib/Pear/LocalLoop/Controller/Api/Upload.pm
@@ -196,7 +196,7 @@ sub post_upload {
       ( defined $file ? ( proof_image => $file ) : () ),
       purchase_time => $c->format_db_datetime($purchase_time),
       distance => $distance,
-      essential => ( defined $essential ? $essential : undef ),
+      essential => ( defined $essential ? $essential : 0 ),
     }
   );