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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
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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): 16.0.3 - 16.0.3.0
Operating system and version (eg, Ubuntu 17.04): Linux 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64
Apache or nginx version (eg, Apache 2.4.25): nginx/1.14.0 (fpm-fcgi)
PHP version (eg, 7.1): 7.3.7-1+ubuntu18.04.1+deb.sury.org+1
The issue you are facing:
I have received notification of pending app updates. If I click on the notification I receive a blank screen.
If I go to the dropdown at the top right hand corner of the homepage and select apps I received a blank page
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
Debug core SCSSCacher: /nextcloud/apps/files/css/upload.scss compiled and successfully cached 2019-07-22T21:07:39+0100
Debug no app in context Failed to get icon file /img/app-dark.svg 2019-07-22T21:07:39+0100
Debug no app in context JSCombiner: successfully cached: merged.js 2019-07-22T21:07:38+0100
Error internet_connection_check GuzzleHttp\Exception\ConnectException: cURL error 7: Failed to connect to www.nextcloud.com port 80: No route to host (see http://curl.haxx.se/libcurl/c/libcurl-errors.html) 2019-07-22T21:06:47+0100
Debug webdav Sabre\DAV\Exception\NotAuthenticated: No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured, No 'Authorization: Bearer' header found. Either the client didn't send one, or the server is mis-configured 2019-07-22T21:05:28+0100
Debug webdav Sabre\DAV\Exception\NotAuthenticated: No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured, No 'Authorization: Bearer' header found. Either the client didn't send one, or the server is mis-configured 2019-07-22T21:05:27+0100
Debug webdav Sabre\DAV\Exception\NotAuthenticated: No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured, No 'Authorization: Bearer' header found. Either the client didn't send one, or the server is mis-configured 2019-07-22T21:05:25+0100
Debug webdav Sabre\DAV\Exception\NotAuthenticated: No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured, No 'Authorization: Bearer' header found. Either the client didn't send one, or the server is mis-configured 2019-07-22T21:05:06+0100
Debug cron Finished OCA\UpdateNotification\ResetTokenBackgroundJob job with ID 25 in 0 seconds
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
{
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"shazjon.hopto.org"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "16.0.3.0",
"overwrite.cli.url": "https:\/\/shazjon.hopto.org\/nextcloud",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"memcache.distributed": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"memcache.local": "\\OC\\Memcache\\APCu",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 6379
},
"maintenance": false,
"theme": "",
"loglevel": 0,
"app_install_overwrite": [
"fulltextsearch_elasticsearch",
"files_fulltextsearch",
"bookmarks_fulltextsearch",
"photosphereviewer"
]
}
The output of your Apache/nginx/system log in /var/log/____:
86.0.60.67 - jonathan [22/Jul/2019:21:24:28 +0100] "GET /nextcloud/index.php/204 HTTP/1.1" 204 0 "-" "Mozilla/5.0 (Android) Nextcloud-android/3.7.0"
86.0.60.67 - jonathan [22/Jul/2019:21:24:28 +0100] "GET /nextcloud/index.php/204 HTTP/1.1" 204 0 "-" "Mozilla/5.0 (Android) Nextcloud-android/3.7.0"
86.0.60.67 - - [22/Jul/2019:21:24:56 +0100] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2078 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:24:58 +0100] "GET /nextcloud/index.php/settings/admin/logging HTTP/2.0" 200 6761 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:24:58 +0100] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2078 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:24:58 +0100] "GET /nextcloud/index.php/apps/logreader/settings HTTP/2.0" 200 99 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:24:58 +0100] "GET /nextcloud/index.php/apps/logreader/get?offset=0&count=50&levels=11111 HTTP/2.0" 200 33457 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:25:18 +0100] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=bQv1ZGGpWVLm99dPdZsr HTTP/2.0" 200 2 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:25:28 +0100] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2078 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:25:28 +0100] "GET /nextcloud/index.php/apps/logreader/get?offset=50&count=25&levels=11111 HTTP/2.0" 200 7115 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:25:38 +0100] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=bQv1ZGGpWVLm99dPdZsr HTTP/2.0" 200 2 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:25:59 +0100] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=bQv1ZGGpWVLm99dPdZsr HTTP/2.0" 200 2 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:25:59 +0100] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2078 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:26:19 +0100] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=bQv1ZGGpWVLm99dPdZsr HTTP/2.0" 200 2 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:26:29 +0100] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2078 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:26:39 +0100] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=bQv1ZGGpWVLm99dPdZsr HTTP/2.0" 200 2 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:26:59 +0100] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2078 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:26:59 +0100] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=bQv1ZGGpWVLm99dPdZsr HTTP/2.0" 200 2 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:27:19 +0100] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=bQv1ZGGpWVLm99dPdZsr HTTP/2.0" 200 2 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:27:29 +0100] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 2078 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
86.0.60.67 - - [22/Jul/2019:21:27:39 +0100] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=bQv1ZGGpWVLm99dPdZsr HTTP/2.0" 200 2 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"