Bucket Defined But Adding To Bucket Named 'null'

I have a template for a report and I'm defining a specific bucket for the images but it's adding them to a bucket named 'null'.

Template:

  <img src="<perch:blog id="hero" type="image" label="Main Image" bucket="Insights" width="1400" />" alt="<perch:blog id="postTitle" type="text" label="Title" />"/>

  <perch:blog id="hero" type="image" label="Main Image" width="1000" height="600" crop="true" suppress="true" bucket="Insights" required="true" />

  <h1><perch:blog id="postTitle" type="text" label="Title" required="true" size="xl autowidth" order="1" /></h1>

  <time class="dt-published" datetime="<perch:blog id="postDateTime" type="date" label="Date" time="false" format="Y-m-d H:i:s" divider-before="Publishing" />">
    <perch:blog id="postDateTime" type="date" time="false" format="%d %B %Y" suppress="true" />
  </time>

Diagnostics:

Perch Runway: 3.0.4
Production mode: Production (100)
Installed apps: content (3.0.4), assets (3.0.4), categories (3.0.4), perch_blog (5.5.1), perch_forms (1.9)
DB driver: PDO
DB tables: perch3_backup_plans (1), perch3_backup_resources (0), perch3_backup_runs (5), perch3_blog_authors (1), perch3_blog_comments (0), perch3_blog_index (356), perch3_blog_posts (13), perch3_blog_posts_to_tags (0), perch3_blog_sections (1), perch3_blog_tags (0), perch3_blogs (2), perch3_categories (4), perch3_category_counts (0), perch3_category_sets (2), perch3_collection_index (172), perch3_collection_items (16), perch3_collection_revisions (8), perch3_collections (1), perch3_content_index (120), perch3_content_items (16), perch3_content_locks (0), perch3_content_regions (1), perch3_menu_items (11), perch3_navigation (0), perch3_navigation_pages (0), perch3_page_routes (2), perch3_page_templates (16), perch3_pages (6), perch3_resource_log (161), perch3_resource_tags (0), perch3_resources (117), perch3_resources_to_tags (0), perch3_settings (26), perch3_user_passwords (0), perch3_user_privileges (37), perch3_user_role_privileges (2), perch3_user_roles (2), perch3_users (1)
Users: 1
App runtimes:
<?php
    $apps_list = array(
        'perch_blog',
        'perch_forms'
    );
Scheduled tasks for perch_blog: delete_spam_comments (1440 mins)
Scheduled tasks for Backup: plan_1 (10 mins)
Editor plug-ins:
H1: 900409a7e55dfc236042156ba480611d
L1: b8e0f7cd814dce17db4311d25a624608
F1: 0c66c2e1f82f9e0b7617b2cb8270f2c7
headerColour: #000000
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 1
content_collapseList: 1
lang: en-gb
installedAt: 3.0.2
update_3.0.2: done
headerScheme: dark
update_runway_3.0.2: done
latest_version:
on_sale_version:
perch_blog_update: 5.0.1
perch_blog_post_url: /insights/{postSlug}
perch_blog_site_name:
perch_blog_slug_format: {postTitle}
perch_blog_akismet_key:
perch_blog_max_spam_days: 7
dashboard: 0
hide_pwd_reset: 0
siteOffline: 0
content_hideNonEditableRegions: 0
content_frontend_edit: 0
perch_blog_comment_notify: 0
update_runway_3.0.4: done
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_SITEPATH: /Users/Toby/Sites/frukt
PERCH_SCHEDULE_SECRET: FH7ILLWtl3v6nY54
PERCH_DB_USERNAME: root
PERCH_DB_SERVER: localhost
PERCH_DB_DATABASE: perch_frukt_local
PERCH_DB_PREFIX: perch3_
PERCH_EMAIL_FROM: noreply@wearefrukt.com
PERCH_EMAIL_FROM_NAME: Frukt
PERCH_LOGINPATH: /admin
PERCH_PATH: /Users/Toby/Sites/frukt/admin
PERCH_CORE: /Users/Toby/Sites/frukt/admin/core
PERCH_RESFILEPATH: /Users/Toby/Sites/frukt/admin/resources
PERCH_RESPATH: /admin/resources
PERCH_HTML5: 1
PERCH_TZ: UTC
PERCH_PRODUCTION_MDODE: PERCH_DEVELOPMENT
PERCH_UNDO_BUFFER: 1
PERCH_RUNWAY: 1
PERCH_ERROR_MODE: DIE
PERCH_DATE_LONG: %d %B %Y
PERCH_DATE_SHORT: %d %b %Y
PERCH_TIME_SHORT: %H:%M
PERCH_TIME_LONG: %H:%M:%S
PERCH_RUNWAY_ROUTED:
PERCH_STRONG_PASSWORDS:
PERCH_ASSET_VERSION: ed79f7a54b300ef2b1e6
PERCH_DEBUG:
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /Users/Toby/Sites/frukt/admin/templates
PERCH_TEMPLATE_FILTERS:
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_PRODUCTION_MODE: 100
PERCH_XHTML_MARKUP:
PERCH_RWD: 1
PERCH_HTML_ENTITIES:
PERCH_SSL:
PERCH_STRIPSLASHES:
PERCH_PROGRESSIVE_FLUSH: 1
PERCH_PARANOID:
PERCH_FORCE_SECURE_COOKIES:
PERCH_DEFAULT_BUCKET: default
PERCH_TRANSLATION_ASSIST:
PERCH_PASSWORD_MIN_LENGTH: 6
PERCH_MAX_FAILED_LOGINS: 10
PERCH_AUTH_LOCKOUT_DURATION: 1 HOUR
PERCH_VERIFY_UPLOADS:
PERCH_PRIV_ASSIST:
PERCH_AUTH_PLUGIN:
PERCH_DB_CHARSET: utf8
PERCH_DB_PORT:
PERCH_DB_SOCKET:
PERCH_APPS_EDITOR_PLUGIN: markitup
PERCH_APPS_EDITOR_MARKUP_LANGUAGE: markdown
Hosting settings

PHP: 7.0.15
Zend: 3.0.0
OS: Darwin
SAPI: cgi-fcgi
Safe mode: not detected
MySQL client: mysqlnd 5.0.12-dev - 20150407 - $Id: b5c5906d452ec590732a93b051f3827e02749b83 $
MySQL server: 5.6.35
Free disk space: 20.81 GB
Extensions: Core, date, libxml, openssl, pcre, sqlite3, zlib, bcmath, bz2, calendar, ctype, curl, dom, hash, fileinfo, filter, ftp, gd, SPL, iconv, intl, json, ldap, mbstring, session, standard, mysqlnd, PDO, pdo_mysql, pdo_sqlite, Phar, posix, readline, Reflection, mysqli, SimpleXML, soap, sockets, exif, tokenizer, wddx, xml, xmlreader, xmlwriter, xsl, zip, cgi-fcgi, imap, gettext, mcrypt, pgsql, pdo_pgsql, igbinary, memcached
GD: Yes
ImageMagick: No
PHP max upload size: 32M
PHP max form post size: 32M
PHP memory limit: 128M
Total max uploadable file size: 32M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: Yes
PHP_FCGI_CHILDREN: 4
PWD: /Applications/MAMP/fcgi-bin
PHP_FCGI_MAX_REQUESTS: 200
__CF_USER_TEXT_ENCODING: 0x1F5:0x0:0x2
ORIG_SCRIPT_NAME: /fcgi-bin/php7.0.15.fcgi
ORIG_PATH_TRANSLATED: /Users/Toby/Sites/frukt/admin/core/settings/diagnostics/index.php
ORIG_PATH_INFO: /admin/core/settings/diagnostics/index.php
ORIG_SCRIPT_FILENAME: /Applications/MAMP/fcgi-bin/php7.0.15.fcgi
SCRIPT_NAME: /admin/core/settings/diagnostics/index.php
REQUEST_URI: /admin/core/settings/diagnostics/?extended
QUERY_STRING: extended
REQUEST_METHOD: GET
SERVER_PROTOCOL: HTTP/1.1
GATEWAY_INTERFACE: CGI/1.1
REDIRECT_URL: /admin/core/settings/diagnostics/index.php
REDIRECT_QUERY_STRING: extended
REMOTE_PORT: 54157
SCRIPT_FILENAME: /Users/Toby/Sites/frukt/admin/core/settings/diagnostics/index.php
SERVER_ADMIN: you@example.com
DOCUMENT_ROOT: /Users/Toby/Sites/frukt
REMOTE_ADDR: ::1
SERVER_PORT: 8888
SERVER_ADDR: ::1
SERVER_NAME: loc.frukt
SERVER_SOFTWARE: Apache
PATH: /usr/bin:/bin:/usr/sbin:/sbin
HTTP_COOKIE: PHPSESSID=4741d69f9b25a57ca3da58d0b0ffa363; cmsa=1
HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.8
HTTP_ACCEPT_ENCODING: gzip, deflate, sdch
HTTP_REFERER: https://loc.frukt:8888/admin/core/settings/diagnostics/
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36
HTTP_UPGRADE_INSECURE_REQUESTS: 1
HTTP_CONNECTION: keep-alive
HTTP_HOST: loc.frukt:8888
REDIRECT_STATUS: 200
REDIRECT_HANDLER: php-fastcgi
FCGI_ROLE: RESPONDER
PHP_SELF: /admin/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1495545374.32
REQUEST_TIME: 1495545374
argc: 1