Use of undefined constant QM_HIDE_SELF

Where does this error display please?

Are you using any add-on plugins for Query Monitor?

No add-on plugins. This is the location:

wp-content/plugins/query-monitor/classes/Collector.php:225

Hello, I have the same PHP error with the latest version of QM with no add-on plugins.

I dug into this, and the error is thrown only if “WPML String Translation” plugin is active..

Thanks for letting me know. That plugin has caused similar problems in the past. I think it tries to do some things too early in the load sequence.

I’ll see if I can find some time to look into it.

Thank you John! Glad I was helpful, please let us know if you find a solution!

Happens to me as well.

@johnbillion this is the stack trace, maybe it can help

	-
app/plugins/query-monitor/classes/Collector.php:225
apply_filters('override_load_textdomain')
load_textdomain()
WPML\S\M\H\PreloadThemeMoFile->WPML\S\M\H\{closure}()
Posizione sconosciuta
array_map()
WPML\C\S\Collection->map()
WPML\S\M\H\PreloadThemeMoFile->WPML\S\M\H\{closure}()
WPML\C\S\Collection->each()
WPML\S\M\H\PreloadThemeMoFile->add_hooks()
WPML_Action_Filter_Loader->run_factory()
WPML_Action_Filter_Loader->load_factory()
WPML_Action_Filter_Loader->load_factory_or_action()
WPML_Action_Filter_Loader->load()
WPML\S\T\Hooks->install()
WPML_ST_Initialize->loadEarlyHooks()
WPML_ST_Initialize->run()
do_action('plugins_loaded')

Thanks @ciromattia , that’s very useful. I’ve seen many problems in the past with WPML or its add-on plugins loading textdomains too early in the load process.

I’ll try to take a look but this isn’t a high priority for me.