Adding new page/article leads to syntax error

  • Hi all,

    while adding a new page etc via “New” or “create” button, my wordpress is navigating to an syntax error page instead of creating the new item.

    SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

    Before showing the syntax error, this html code is visible:

    <!DOCTYPE html>
<html class="wp-toolbar"
	lang="de-DE">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<title>Neuen Beitrag erstellen &lsaquo; Hey Koala - Anti Kater Drink — WordPress</title>
<script type="text/javascript">
addLoadEvent = function(func){if(typeof jQuery!=='undefined')jQuery(document).ready(func);else if(typeof wpOnload!=='function'){wpOnload=func;}else{var oldonload=wpOnload;wpOnload=function(){oldonload();func();}}};
var ajaxurl = '/wp-admin/admin-ajax.php',
	pagenow = 'post',
	typenow = 'post',
	adminpage = 'post-new-php',
	thousandsSeparator = '.',
	decimalPoint = ',',
	isRtl = 0;
</script>
<!-- script to print the admin localized variables --><script type="text/javascript">var cartflows_admin = {"ajaxurl":"https:\/\/heykoala.de\/wp-admin\/admin-ajax.php","ajax_nonce":"537cf876ec","wc_status":{"installed":true,"active":true},"wc_activating_message":"Installing and activating..","wc_install_error":"There was an error with the installation of plugin.","wcf_edit_test_mode":false,"wcf_fetch_stats_nonce":"d1e8982fee","wcf_setup_default_steps_nonce":"a2e6358c99","wcf_add_flow_step_nonce":"d5e7bdd7e0","wcf_delete_flow_step_nonce":"8bf4ab37e1","wcf_reorder_flow_steps_nonce":"ea3a803d85","wcf_clone_flow_step_nonce":"628291df25","cf_step_import_nonce":"fa8ddfaf0b","cf_load_steps_nonce":"a463e8b9d1","cf_create_flow_nonce":"dd7ff66496","cf_default_flow_nonce":"97af7dcc6b","cf_step_create_blank_nonce":"30bfd7da10","cf_import_flow_step_nonce":"72723bc8b9","wcf_json_search_pages_nonce":"5338a1fe3d","wcf_json_search_coupons_nonce":"c078607e39","wcf_json_search_products_and_variations_nonce":"e2b278993d","create_product_src":"https:\/\/heykoala.de\/wp-admin\/post-new.php?post_type=product&wcf-woo-iframe=true"};</script><!-- script to print the admin localized variables --><script type="text/javascript">var wcf = {"ajax_url":"https:\/\/heykoala.de\/wp-admin\/admin-ajax.php"

    My wordpress data:

    ### wp-core ###

version: 5.5
site_language: de_DE
user_language: de_DE
timezone: Europe/Berlin
permalink: /%year%/%monthnum%/%day%/%postname%/
https_status: true
user_registration: 0
blog_public: 1
default_comment_status: open
multisite: false
user_count: 2
dotorg_communication: true

### wp-paths-sizes ###

wordpress_path: /kunden/609637_47051/webseiten/wordpress
wordpress_size: 865,53 MB (907578357 bytes)
uploads_path: /kunden/609637_47051/webseiten/wordpress/wp-content/uploads
uploads_size: 606,83 MB (636312335 bytes)
themes_path: /kunden/609637_47051/webseiten/wordpress/wp-content/themes
themes_size: 443,20 kB (453832 bytes)
plugins_path: /kunden/609637_47051/webseiten/wordpress/wp-content/plugins
plugins_size: 188,26 MB (197401557 bytes)
database_size: 23,75 MB (24903680 bytes)
total_size: 1,65 GB (1766649761 bytes)

### wp-dropins (1) ###

advanced-cache.php: true

### wp-active-theme ###

name: Hello Elementor (hello-elementor)
version: 2.3.0
author: Elementor Team
author_website: https://elementor.com/?utm_source=wp-themes&utm_campaign=author-uri&utm_medium=wp-dash
parent_theme: none
theme_features: core-block-patterns, post-thumbnails, menus, automatic-feed-links, title-tag, html5, custom-logo, editor-style, woocommerce, wc-product-gallery-zoom, wc-product-gallery-lightbox, wc-product-gallery-slider
theme_path: /kunden/609637_47051/webseiten/wordpress/wp-content/themes/hello-elementor
auto_update: Deaktiviert

### wp-mu-plugins (1) ###

Elementor Safe Mode: version: 1.0.0, author: Elementor.com

### wp-plugins-active (29) ###

301 Redirects: version: 2.51, author: WebFactory Ltd, Automatische Aktualisierung aktiviert
Ajax Cart AutoUpdate for WooCommerce: version: 1.5.4, author: taisho, Automatische Aktualisierungen deaktiviert
All-in-One WP Migration: version: 7.26, author: ServMask, Automatische Aktualisierungen deaktiviert
Autoptimize: version: 2.7.6, author: Frank Goossens (futtta), Automatische Aktualisierung aktiviert
BackWPup: version: 3.7.1, author: Inpsyde GmbH, Automatische Aktualisierungen deaktiviert
Borlabs Cookie - Cookie Opt-in: version: 2.2.8, author: Benjamin A. Bornschein, Borlabs, Automatische Aktualisierungen deaktiviert
CartFlows: version: 1.5.15, author: CartFlows Inc, Automatische Aktualisierungen deaktiviert
Compress JPEG & PNG images: version: 3.2.1, author: TinyPNG, Automatische Aktualisierung aktiviert
Elementor: version: 3.0.0-beta5, author: Elementor.com, Automatische Aktualisierung aktiviert
Elementor Pro: version: 3.0.0-beta2, author: Elementor.com, Automatische Aktualisierungen deaktiviert
Enable Media Replace: version: 3.4.2, author: ShortPixel, Automatische Aktualisierungen deaktiviert
Envato Elements: version: 2.0.5, author: Envato, Automatische Aktualisierungen deaktiviert
Essential Addons for Elementor: version: 4.2.0, author: WPDeveloper, Automatische Aktualisierungen deaktiviert
Flexible Shipping: version: 3.11.2, author: WP Desk, Automatische Aktualisierungen deaktiviert
Germanized for WooCommerce: version: 3.1.12, author: vendidero, Automatische Aktualisierung aktiviert
Jetpack by WordPress.com: version: 8.8.2, author: Automattic, Automatische Aktualisierung aktiviert
Mailchimp for WooCommerce: version: 2.4.5, author: Mailchimp, Automatische Aktualisierung aktiviert
Pfand (Deposit) for WooCommerce Products: version: 2.0.0, author: Nerdissimo, Automatische Aktualisierung aktiviert
Post SMTP: version: 2.0.15, author: Yehuda Hassine, Automatische Aktualisierungen deaktiviert
Rank Math SEO: version: 1.0.47, author: Rank Math, Automatische Aktualisierung aktiviert
Statify: version: 1.8.0, author: pluginkollektiv, Automatische Aktualisierungen deaktiviert
Two Factor: version: 0.6.0, author: Plugin Contributors, Automatische Aktualisierungen deaktiviert
W3 Total Cache: version: 0.14.4, author: BoldGrid, Automatische Aktualisierungen deaktiviert
WooCommerce: version: 4.3.3, author: Automattic, Automatische Aktualisierung aktiviert
WooCommerce PayPal Checkout Gateway: version: 2.0.3, author: WooCommerce, Automatische Aktualisierung aktiviert
WooCommerce PDF Invoices & Packing Slips: version: 2.5.4, author: Ewout Fernhout, Automatische Aktualisierung aktiviert
WooCommerce Services: version: 1.24.0, author: Automattic, Automatische Aktualisierung aktiviert
Woolementor: version: 1.5.0, author: Woolementor, Automatische Aktualisierung aktiviert
WP Force SSL: version: 1.55, author: WebFactory Ltd, Automatische Aktualisierung aktiviert

### wp-media ###

image_editor: WP_Image_Editor_Imagick
imagick_module_version: 1691
imagemagick_version: ImageMagick 6.9.11-27 Q16 x86_64 2020-08-12 https://imagemagick.org
file_uploads: File uploads is turned off
post_max_size: 75M
upload_max_filesize: 50M
max_effective_size: 50 MB
max_file_uploads: 20
imagick_limits: 
	imagick::RESOURCETYPE_AREA: 59 GB
	imagick::RESOURCETYPE_DISK: 9.2233720368548E+18
	imagick::RESOURCETYPE_FILE: 786432
	imagick::RESOURCETYPE_MAP: 59 GB
	imagick::RESOURCETYPE_MEMORY: 29 GB
	imagick::RESOURCETYPE_THREAD: 1
gd_version: 2.2.5
ghostscript_version: 9.25

### wp-server ###

server_architecture: Linux 3.10.0-1127.18.2.el7.x86_64 x86_64
httpd_software: Apache
php_version: 7.4.9 64bit
php_sapi: fpm-fcgi
max_input_variables: 1500
time_limit: 60
memory_limit: 256M
max_input_time: 60
upload_max_size: 50M
php_post_max_size: 75M
curl_version: 7.61.1 OpenSSL/1.1.1c
suhosin: false
imagick_availability: true
pretty_permalinks: true
htaccess_extra_rules: true

### wp-database ###

extension: mysqli
server_version: 10.4.12-MariaDB
client_version: mysqlnd 7.4.9

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /kunden/609637_47051/webseiten/wordpress/wp-content
WP_PLUGIN_DIR: /kunden/609637_47051/webseiten/wordpress/wp-content/plugins
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG: false
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: true
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_LOCAL_DEV: undefined
DB_CHARSET: utf8
DB_COLLATE: undefined

### wp-filesystem ###

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable
mu-plugins: writable

### jetpack ###

site_id: 178545807
ssl_cert: No
time_diff: -1
version_option: 8.8.2:1597682486
old_version: 8.8.1:1597142001
public: Public
master_user: #1 Ruben ()
current_user: #1 Ruben ()
tokens_set: Blog User
blog_token: Bi#LHCYsHWqXT$1P@YO2d^mvHCS#!v4
user_token: Xq&%LKiu@rU!NMrKSQrvR6C)X1Tq^v*V
version: 8.8.2
jp_plugin_dir: /kunden/609637_47051/webseiten/wordpress/wp-content/plugins/jetpack/
plan: free
HTTP_HOST: heykoala.de
SERVER_PORT: 443
HTTPS: on
REMOTE_ADDR: 2a02:908:eb49:cba0:214c:c0a4:61fb:2151
protect_header: {"trusted_header":"REMOTE_ADDR","segments":1,"reverse":false}
full_sync: {"started":"Sun, 07 Jun 2020 19:32:47 +0000","finished":"Sun, 07 Jun 2020 19:32:53 +0000","progress":{"options":{"finished":true},"functions":{"finished":true},"constants":{"finished":true},"users":{"total":"1","sent":1,"finished":true,"last_sent":"1"}},"config":{"options":true,"functions":true,"constants":true,"users":[1]}}
sync_size: undefined
sync_lag: 0 seconds
full_sync_size: undefined
full_sync_lag: 0 seconds
idc_urls: {"home":"https:\/\/heykoala.de","siteurl":"https:\/\/heykoala.de","WP_HOME":"","WP_SITEURL":""}
idc_error_option: false
idc_optin: true
cxn_tests: All Pass.

    Thanks for your support!
    best regards Ruben

    The page I need help with: [log in to see the link]

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