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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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 (eg, 12.0.2): 13.0.1
Operating system and version (eg, Ubuntu 17.04): OpenBSD 6.3
Apache or nginx version (eg, Apache 2.4.25): OpenBSD httpd
PHP version (eg, 7.1): 5.6.34
The issue you are facing:
Users are unable to update any personal information. Ex: entering an email address does not stick with the user when they move to another page.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Click on user icon in upper right corner and select “Settings”
- Enter email address
- Move to another page
The output of your Nextcloud log in Admin > Logging:
|Error|mail|InvalidArgumentException: Invalid email address|2018-08-06T19:30:11-0500|
|---|---|---|---|
|Error|PHP|Undefined offset: 1 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232|2018-08-06T19:16:17-0500|
|Error|PHP|Undefined offset: 0 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231|2018-08-06T19:16:17-0500|
|Error|PHP|Undefined offset: 1 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232|2018-08-06T19:16:17-0500|
|Error|PHP|Undefined offset: 0 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231|2018-08-06T19:16:17-0500|
|Error|PHP|Undefined offset: 1 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232|2018-08-06T19:14:08-0500|
|Error|PHP|Undefined offset: 0 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231|2018-08-06T19:14:08-0500|
|Error|PHP|Undefined offset: 1 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232|2018-08-06T19:14:08-0500|
|Error|PHP|Undefined offset: 0 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231|2018-08-06T19:14:08-0500|
|Error|PHP|Undefined offset: 1 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232|2018-08-06T19:10:25-0500|
|Error|PHP|Undefined offset: 0 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231|2018-08-06T19:10:25-0500|
|Error|PHP|Undefined offset: 1 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232|2018-08-06T19:10:25-0500|
|Error|PHP|Undefined offset: 0 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231|2018-08-06T19:10:25-0500|
|Error|PHP|Undefined offset: 1 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232|2018-08-06T18:51:01-0500|
|Error|PHP|Undefined offset: 0 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231|2018-08-06T18:51:01-0500|
|Error|PHP|Undefined offset: 1 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#232|2018-08-06T18:51:01-0500|
|Error|PHP|Undefined offset: 0 at /nextcloud/apps/dav/lib/CalDAV/Activity/Provider/Calendar.php#231|2018-08-06T18:51:01-0500|
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '****************',
'passwordsalt' => '****************',
'secret' => '*********************************',
'trusted_domains' =>
array (
0 => 'cloud.************',
),
'datadirectory' => '/nextcloud/data',
'overwrite.cli.url' => 'https://cloud.***********',
'dbtype' => 'mysql',
'version' => '13.0.1.1',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextcloud',
'dbpassword' => '*********',
'installed' => true,
'integrity.check.disabled' => true,
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
'timeout' => 0,
),
'maintenance' => false,
'mail_smtpmode' => 'smtp',
'mail_smtpauthtype' => 'PLAIN',
'mail_from_address' => 'nextcloud',
'mail_domain' => 'ceidem.com',
'mail_smtphost' => 'localhost',
'mail_smtpport' => '25',
'mail_smtpsecure' => 'tls',
'allow_user_to_change_display_name' => true,
'log_query' => true,
'loglevel' => 1,
);
The output of your Apache/nginx/system log in /var/log/____:
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:36:54 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:37:04 +0000] "PROPFIND /remote.php/dav/files/ceidem/ HTTP/1.1" 207 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:37:22 +0000] "PROPFIND /remote.php/dav/files/ceidem/ HTTP/1.1" 207 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:37:24 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:37:33 +0000] "PROPFIND /remote.php/dav/files/ceidem/ HTTP/1.1" 207 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:37:53 +0000] "PROPFIND /remote.php/dav/files/ceidem/ HTTP/1.1" 207 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:37:54 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:38:03 +0000] "GET /ocs/v2.php/apps/notifications/api/v1/notifications?format=json HTTP/1.1" 200 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:38:04 +0000] "PROPFIND /remote.php/dav/files/ceidem/ HTTP/1.1" 207 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:38:04 +0000] "PUT /index.php/settings/users/ceidem/settings HTTP/1.1" 422 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:38:08 +0000] "PUT /index.php/settings/users/ceidem/settings HTTP/1.1" 422 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:38:13 +0000] "PUT /index.php/settings/users/ceidem/settings HTTP/1.1" 422 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:38:14 +0000] "PUT /index.php/settings/users/ceidem/settings HTTP/1.1" 422 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:38:24 +0000] "PROPFIND /remote.php/dav/files/ceidem/ HTTP/1.1" 207 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:38:24 +0000] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 0
XXXXXXXXXX XXXXXXXXXX - - [08/Aug/2018:22:38:33 +0000] "PROPFIND /remote.php/dav/files/ceidem/ HTTP/1.1" 207 0