Get a blank page when I try to edit a page or course

Hi @michaelweiner
thanks for reporting this.

I’m actually unable to reproduce it on my local install, so I guess it might have to do with your website “configuration”…

Could you please share your system report?

Also, have you already tried to disable all your plugins, and see if the issue still occurs?

Thanks!

Hi Rocco @d4z_c0nf,
thank you for looking in to this.
I only used two other plugins, W3 Total Cache and Wordfence. I tried deactivating W3 total Cache, but that didnt change anything.

Here is my System Report;

Wordpress
-------------------------------------------

Home Url: https://weiner-beratung.de
Site Url: https://weiner-beratung.de
Login Url: 
Version: 5.6
Debug Mode: No
Debug Log: No
Debug Display: Yes
Locale: de_DE
Multisite: No
Page For Posts: Blog (#11) [https://weiner-beratung.de/blog/]
Page On Front: Michael Weiner (#53) [https://weiner-beratung.de/]
Permalink Structure: /%year%/%monthnum%/%day%/%postname%/
Show On Front: page
Wp Cron: Yes

Settings
-------------------------------------------

Version: 4.13.0
Db Version: 4.13.0
Course Catalog: Kurs Katalog (#425) [https://weiner-beratung.de/courses/]
Membership Catalog: Mitglieder Katalog (#426) [https://weiner-beratung.de/memberships/]
Student Dashboard: Dashboard (#186) [https://weiner-beratung.de/dashboard/]
Checkout Page: Kasse (#185) [https://weiner-beratung.de/purchase/]
Course Catalog Per Page: 9
Course Catalog Sorting: menu_order,ASC
Membership Catalog Per Page: 9
Membership Catalog Sorting: menu_order
Site Membership: Not Set
Courses Endpoint: my-courses
Edit Endpoint: edit-account
Lost Password Endpoint: lost-password
Vouchers Endpoint: redeem-voucher
Autogenerate Username: yes
Password Strength Meter: yes
Minimum Password Strength: strong
Terms Required: no
Terms Page: Not Set
Checkout Names: required
Checkout Address: hidden
Checkout Phone: hidden
Checkout Email Confirmation: yes
Open Registration: no
Registration Names: required
Registration Address: optional
Registration Phone: optional
Registration Voucher: optional
Registration Email Confirmation: yes
Account Names: required
Account Address: hidden
Account Phone: optional
Account Email Confirmation: yes
Confirmation Endpoint: confirm-payment
Force Ssl Checkout: yes
Country: DE
Currency: EUR
Currency Position: right_space
Thousand Separator: .
Decimal Separator: ,
Decimals: 2
Trim Zero Decimals: no
Recurring Payments: yes
Email From Address: [email protected]
Email From Name: Michael Weiner
Email Footer Text:
Email Header Image:
Cert Bg Width: 800
Cert Bg Height: 616
Cert Legacy Compat: no

Constants
-------------------------------------------

LLMS_REMOVE_ALL_DATA: undefined
LLMS_REST_DISABLE: undefined
LLMS_SITE_FEATURE_RECURRING_PAYMENTS: undefined
LLMS_SITE_IS_CLONE: undefined

Gateways
-------------------------------------------

Manuell: Enabled
Manuell Logging: no
Manuell Order: 1

Server
-------------------------------------------

Mysql Version: 5.6.42
Php Curl: Yes
Php Default Timezone: UTC
Php Fsockopen: Yes
Php Max Input Vars: 4000
Php Max Upload Size: 64 MB
Php Memory Limit: 256M
Php Post Max Size: 76M
Php Soap: Yes
Php Suhosin: No
Php Time Limt: 240
Php Version: 7.4.13
Software: Apache/2.4.43 (Unix)
Wp Memory Limit: 40M

Browser
-------------------------------------------

HTTP USER AGENT: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0

Theme
-------------------------------------------

Name: Neve
Version: 2.10.0
Themeuri: https://themeisle.com/themes/neve/
Authoruri: https://themeisle.com
Template:
Child Theme: No
Llms Support: Yes

Plugins
-------------------------------------------

LifterLMS: 4.13.0
W3 Total Cache: 2.1.0
Wordfence Security: 7.4.14

Integrations
-------------------------------------------

BbPress: No
BuddyPress: No

Template Overrides
-------------------------------------------

• This reply was modified 4 years, 1 month ago by Yui.
• This reply was modified 4 years, 1 month ago by Yui. Reason: please use CODE button for proper formatting

@michaelweiner
thanks!

I’m honestly unable to reproduce this issue :/
Something really weird is happening there. This is where the js variable (that the error you provided refers as missing) is set in the plugin codebase:
https://github.com/gocodebox/lifterlms-blocks/blob/1.12.0/includes/class-llms-blocks.php#L91

I cannot see why it shouldn’t work on your site too.

Maybe you can enable the debug logging to see if there’s any PHP error/warning that could give some hints on what’s going on:
https://lifterlms.com/docs/how-to-debug-a-white-screen/#log
?

@michaelweiner do you have any concatenation or minification going on with your W3 Total Cache settings? Can you try disabling it for a bit and seeing if that could alleviate the issue?

@thomasplevy @d4z_c0nf Thanks for your help. I had minifcation activated in W3 Total Cahe. I tried deactivating W3 Total Cache, but it didnt change anything. But I wonder, if I had minifying activated, and W3 Total Cache minified the CSS and JS on my site, does deactivation W3 Total Cache restore the original non-minified code? Or has the damage already been done when it has once minified the code. Anyway, I gave up on it, and restored my site with an update. Can’t be bother now to eperiment until it works.
Thanks very much for your help, I really appreciate it!

@michaelweiner

I really don’t know exactly how the minification and concatentation actually works but I have seen caching plugins which make changes to files on your site (like .htaccess, for example) which are not automatically removed on plugin deactivation (but will be on plugin deletion, sometimes).

It could be that… I’m not sure. I’d recommend reaching out to the plugin devs if you’re having issues with that.

Glad you figured it out though