Can't load admin pages when this theme is enabled.

[tuxgirl]

Hi!
If I have bootstrap-darkroom enabled, I can't load the admin pages page for my piwigo instance. It returns a 502 from nginx. If I tail the nginx logs from piwigo while attempting to load the admin.php page, I receive:

2025/11/04 19:49:37 [error] 273#273: *1176 FastCGI sent in stderr: "PHP message: PHP Warning:  Undefined array key "meta_ref_enabled" in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 39; PHP message: PHP Warning:  Attempt to read property "value" on null in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 39; PHP message: PHP Warning:  Undefined array key "theme_config" in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 128; PHP message: PHP Warning:  Attempt to read property "value" on null in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 128; PHP message: PHP Warning:  Attempt to read property "bootstrap_theme" on null in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 128; PHP message: PHP Warning:  Undefined array key "theme_config" in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 135; PHP message: PHP Warning:  Attempt to read property "value" on null in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 135; PHP message: PHP Warning:  Attempt to read property "bootstrap_theme" on null in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 135; PHP message: PHP Warning:  Undefined array key "theme_config" in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 135; PHP message: PHP Warning:  Attempt to read property "value" on null in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 135; PHP message: PHP Warning:  Attempt to read property "bootstrap_theme" on null in /config/www/_data/templates_c/1yju0id^31d431bc39ca
2025/11/04 19:49:37 [error] 273#273: *1176 FastCGI sent in stderr: "c85814c64f53de6c_0.file.header.tpl.php on line 167; PHP message: PHP Warning:  Attempt to read property "bootstrap_theme" on null in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 167; PHP message: PHP Deprecated:  preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 167; PHP message: PHP Warning:  Undefined array key "theme_config" in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 357; PHP message: PHP Warning:  Attempt to read property "value" on null in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 357; PHP message: PHP Warning:  Attempt to read property "page_header" on null in /config/www/_data/templates_c/1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php on line 357; PHP message: PHP Warning:  Undefined array key "theme_config" in /config/www/_data/templates_c/1yju0id^41418a2f246909bfd4bed5e5a2aa65e1deca6e21_0.file.redirect.tpl.php on line 24; PHP message: PHP Warning:  Attempt to read property "value" on null in /config/www/_data/templates_c/1yju0id^41418a2f246909bfd4bed5e5a2aa65e1deca6e21_0.file.redirect.tpl.php on line 24; PHP message: PHP Warning:  Attempt to read property "fluid_width" on null in /config/www/_data/templates_c/1yju0id^41418a2f246909bfd4bed5e5a2aa65e1deca6e21_0.file.redirect.tpl.php on line 24; PHP message: PHP Warning:  Undefined array key "theme_config" in /config/www/_data/templates_c/1yju0id^41418a2f246909bfd4bed5e5a2aa65e1deca6e21_0.file.redirect.tpl.php on line 29; PHP message: PHP Warning:  Attempt to read property "value" on null in /config/www/_data/templates_c/1yju0id^41418a2f246909bfd4bed5e5a2aa65e1deca6e21_0.file.redirect.tpl.php on line 29; PHP message: PHP Warnin
2025/11/04 19:49:37 [error] 273#273: *1176 upstream sent too big header while reading response header from upstream, client: 10.89.2.29, server: _, request: "GET /admin.php HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "liquidfortress.com"

If I comment out lines 167-169 and 171 of 1yju0id^31d431bc39caa6c246e67d7bc85814c64f53de6c_0.file.header.tpl.php, I am able to load the admin.php page (although it flashes some php errors in the process), but I've found that this change gets overwritten somehow regularly (appears to be when I log out of being an admin?).
The problem appears to be with the sign in page (identification.php).

I am currently on version 15.7.0 of piwigo, running in a podman container with mariadb. It looks like I'm using version 15.d of Bootstrap-Darkroom.

I do have some custom CSS. I don't think it's causing the problem, but this is what it is:

/* this will turn off the darkening of the hero image */
.page-header:before {
    background-color: transparent!important; 
}

/* move the text to where you want it in the hero image */

.page-header > .container > .content-center {
  max-width: 800px;
  top: 30%;
  /* left: 20%; */
}


/* Make the text in the top header white instead of grey */
p {
  color: #ffffff;
}

pwsp__bg {
background: #222222;
}

I would love any assistance I can get in resolving this! I really like the theme, and have it working the way I want for my website. It's just a pain having to go in and comment out lines of php every time I want to do anything as admin is troublesome.

Thanks for the help!