Woocommerce internal server error on checkout

Question

I am experiencing this weird problem with my.htaccess file everytime I tried to checkout on my woocommerce site. This is the.htaccess file I currently have..

# BEGIN REMOVE SLUG CUSTOM POST TYPE RULES
RewriteRule ^slider/(.+)/$ /$1 [R=301,L]
# END REMOVE SLUG CUSTOM POST TYPE RULES


# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

but its strangely become like this after I checkout

# BEGIN REMOVE SLUG CUSTOM POST TYPE RULES
RewriteRule ^slider/(.+)/$ /$1 [R=301,L]
# END REMOVE SLUG CUSTOM POST TYPE RULES


# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
Rewrit

and 500 server error prompt up instead of showing thank you page but its all working if I fixed the.htaccess file manually and refresh the same page, thank you page will show and also order was recorded fine even if I don't fixed the.htaccess file.

I created my own woocommerce child theme for this site and I am using only two plugins called "Remove slug from custom post type" and "SEO Ultimate" to make the product and category urls as I needed and both plugins seems to be changing.htaccess on the fly, but I am not really sure why only on checkout it makes.htaccess file cut off like that...? These are the url where I'am getting this error

http://mysite.dev/checkout/order-received/709?key=wc_order_53db13e068104

its redirect to this url after I correct.htaccess manually. http://mysite.dev/checkout/order-received/709/?key=wc_order_53db13e068104

also this error doesn't occur all the time please help!

Answer 1

I got the same error then I just added the following line to my wp-config.php

define( 'WP_DEBUG', true );
define( 'WP_DEBUG_DISPLAY', false );
define( 'WP_DEBUG_LOG', true );

This will turn on WordPress debugging feature and write the log into file instead of displaying it on your front-end.

After that executing the webpage again. I got the exact function name causing error in my log file and I just resolved that function issue.