htaccess rule giving 500 internal server error

Question

I am getting errors when I am trying to rewrite URL.

From this:

www.example.com/products/product-details.php?alias=abc-def-123

To this:

www.example.com/products/abc-def-123

Here is my .htaccess file

#Turn Rewrite Engine On
Options +FollowSymLinks -MultiViews
Options -Indexes

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /

RewriteCond %{HTTP_HOST} ^www.example.com [NC]
RewriteRule ^(.*)$ https://example.com/$1 [L,R=301]

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^(.*)$ $1.html [NC,L]

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php [NC,L]

RewriteCond %{ENV:REDIRECT_STATUS} ^$
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^products/([a-zA-Z0-9-]+)$ products/product-details.php?alias=$1 [NC,L]

</IfModule>

I am hitting this URL:

www.example.com/products/abc-def-123

Update:

Answer 1

Yeah!!!!!!! I solved my problem myself and also I want to thanks @RavinderSingh13 to make effort.

Here is the whole .htaccess file

<IfModule mod_rewrite.c>
Options +FollowSymLinks -MultiViews -Indexes
RewriteEngine On
RewriteBase /

RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC]
RewriteRule ^(.*)/?$ https://example.com/$1 [L,NE,R=301]

RewriteRule ^products/([^/\.]+)?$ products/product-details.php?alias=$1 [NC,L]  

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.html -f [NC]
RewriteRule ^(.*)/?$ $1.html [NC,L]

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f [NC]
RewriteRule ^(.*)/?$ $1.php [NC,L]

</IfModule>