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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version 13.0.3
Operating system and version Docker image apache w/nginx frontend
Apache or nginx version: apache that comes w/docker image, nginx 1.15.5
PHP version (eg, 7.1): 7.2.11 (version that came w/docker image)
The issue you are facing:
When sharing via email, the logo is not display person that received the email. This is same with default logo, or if I use the theme app and use our own logo
Is this the first time you’ve seen this error? N
Steps to replicate it:
- share a file/directory
- check you email
- no logo
The output of your Nextcloud log in Admin > Logging:
|Error|PHP|imagedestroy() expects parameter 1 to be resource, null given at /var/www/html/apps/theming/lib/Controller/ThemingController.php#295|an hour ago|
|---|---|---|---|
|Error|PHP|imagejpeg() expects parameter 1 to be resource, null given at /var/www/html/apps/theming/lib/Controller/ThemingController.php#294|an hour ago|
|Error|PHP|imageinterlace() expects parameter 1 to be resource, null given at /var/www/html/apps/theming/lib/Controller/ThemingController.php#293|an hour ago|
|Error|PHP|imagescale() expects parameter 1 to be resource, boolean given at /var/www/html/apps/theming/lib/Controller/ThemingController.php#291|an hour ago|
|Error|PHP|Division by zero at /var/www/html/apps/theming/lib/Controller/ThemingController.php#290|an hour ago|
|Error|PHP|imagesx() expects parameter 1 to be resource, boolean given at /var/www/html/apps/theming/lib/Controller/ThemingController.php#290|an hour ago|
|Error|PHP|imagesy() expects parameter 1 to be resource, boolean given at /var/www/html/apps/theming/lib/Controller/ThemingController.php#290|an hour ago|
|Error|PHP|imagesx() expects parameter 1 to be resource, boolean given at /var/www/html/apps/theming/lib/Controller/ThemingController.php#289|an hour ago|
|Error|PHP|imagesx() expects parameter 1 to be resource, boolean given at /var/www/html/apps/theming/lib/Controller/ThemingController.php#289|an hour ago|
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'htaccess.RewriteBase' => '/',
'memcache.local' => '\\OC\\Memcache\\APCu',
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'instanceid' => 'myinstance',
'passwordsalt' => 'mysalt',
'secret' => 'mysecret',
'trusted_domains' =>
array (
0 => 'kvm01:8080',
1 => 'kvm01.corvidtec.com:8080',
2 => 'vault.corvidtec.com:443',
3 => 'vault.corvidtec.com',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'pgsql',
'version' => '14.0.3.0',
'overwrite.cli.url' => 'http://kvm01:8080',
'dbname' => 'nextcloud',
'dbhost' => 'database_1:5432',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'auser',
'dbpassword' => 'password',
'installed' => true,
'mail_from_address' => 'noreply',
'mail_smtpmode' => 'smtp',
'mail_domain' => 'corvidtec.com',
'mail_smtphost' => 'mail',
'mail_smtpport' => '25',
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'theme' => '',
'loglevel' => 2,
'maintenance' => false,
);
The output of your Apache/nginx/system log in /var/log/____: