Wordpress LScache Plugin: CSS Combine Periodically Missing Content
Last Updated on: Wed, 15 Apr 2026 00:00:02 I have been using LSCache for about 3 years now on around 45 sites. Over this time I have noticed on many occasions that I will check on a site that has been running fine and see that the site is broken (displaying incorrectly: css issues). On investigation, I see that the combined css file is very small and only contains a fraction of the content it should contain. If I save the file and clear the cache out. I then get the site running again and if I compare the two combined files, the new one now contains all the css again. I have noted that the broken combined file is always broken cleanly at the end/beginning of where the next file should be placed in the combined file. What would cause this to happen and how can I prevent it/fix it? I am now just turning off combine on all my sites. With HTTP2 its probably not of any benefit anyway, but a solution would still be ideal as this is just avoiding the issue not resolving it. This topic was modified 1 year, 3 months ago by miketemby. I also see broken pages. Everything is fine when I delete all cache and let it rebuild, a week later the problem is back. Its like building the original cache is fine, but rebuilding it when needed causes an issue. Could it be related to the cache TTL which is set to a week and serving stale cache? Did you happen to see anything in PHP error log ? @CacheCrawler as it always occurs in production sites, I do not have debugging enabled so no errors available. I will attempt to produce the error manually in a dev environment by setting a very short ttl, however I am unsure of the exact conditions required to for the issue to present itself so this may not be achievable. One observation I have made, which may simply be a coincidence and due to the nature of most css files, but the break that I have observed has been where comments are on the css file. But this may simply be that most css files begin with a comments block? and the break occurs on a new css file? may I know if you are on v4.2 or v3.6.4 ? if on 4.2 , did you enable UCSS ? 3.6.4 at the moment on the site it just occurred most recently on. It actually occurred twice this week on two different sites. What is UCSS? I will point out that this has occurred many times over the years, its just that I only now investigated it deeply enough to determine that the combined file was not being built properly. And I will also point out that at has occurred when the plugin was up to date at the time it occurred. Im pointing this it in preparation for you telling me to update to the latest version and see if the issue persists?. If you are unfamiliar with the issue existing, there is no reason the latest release would fix it.. fixes dont tend to be developed for bugs that are not known. I have the same problem with combined css files with the latest version 4.2 and i had to go back to 3.6.4 version. Hi, please: download https://www.litespeedshare.net/2021/08/92db40-debug.zip this package contains 3 modified files with more debug log enabled, for v4.3 version only please replace them into /wp-content/plugins/litespeed-cache/src/ to override exsiting ones now edit wp-config.php find line define(WP_DEBUG, false) add in front it to comment it out , then add define(WP_DEBUG, true) define(WP_DEBUG_LOG, true) define(WP_DEBUG_DISPLAY,false) after it and then go to wp-admin -> LSCWP -> toolbox -> debug setting set debug log to admin IP only and add your IP in below box in Debug URI Excludes field ,add admin ajax into it , save and purge all and then wait for it happens again once it happens , please send /wp-content/debug.log and PHP error log (typically located /public_html/error_log on cPanel) to support at litespeedtech.com with reference link to this topic Best regards, Hi, there is a patch for combined files 404 error in v4.4-rc4 , please upgrade to it and see how it goes you can get it in toolbox -> beta test -> click dev and upgrade Best regards,
LiteCache Rush: Speed comes from using less, not from doing it faster
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