I'm logged in. I go to https://de.wikipedia.org/wiki/Hilfe:Echo and click one of the two notification icons in the top right corner of the screen. In non-debug mode I get:
Exception in module-execute in module moment: TypeError: moment is undefined Stack trace: @https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=ext.echo.controller%2Cdm%2Clogger%2Cui%7Cext.echo.styles.notifications%7Cext.echo.ui.desktop%7Cmoment%2Coojs-ui-core%2Coojs-ui-widgets%7Coojs-ui-core.styles%7Coojs-ui.styles.icons%2Cicons-alerts%2Cicons-content%2Cicons-interactions%2Cicons-moderation%2Cicons-user%2Cindicators%2Ctextures%7Cschema.EchoInteraction&skin=vector&version=0eatlxh:146:693 @https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=ext.echo.controller%2Cdm%2Clogger%2Cui%7Cext.echo.styles.notifications%7Cext.echo.ui.desktop%7Cmoment%2Coojs-ui-core%2Coojs-ui-widgets%7Coojs-ui-core.styles%7Coojs-ui.styles.icons%2Cicons-alerts%2Cicons-content%2Cicons-interactions%2Cicons-moderation%2Cicons-user%2Cindicators%2Ctextures%7Cschema.EchoInteraction&skin=vector&version=0eatlxh:146:206 @https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=ext.echo.controller%2Cdm%2Clogger%2Cui%7Cext.echo.styles.notifications%7Cext.echo.ui.desktop%7Cmoment%2Coojs-ui-core%2Coojs-ui-widgets%7Coojs-ui-core.styles%7Coojs-ui.styles.icons%2Cicons-alerts%2Cicons-content%2Cicons-interactions%2Cicons-moderation%2Cicons-user%2Cindicators%2Ctextures%7Cschema.EchoInteraction&skin=vector&version=0eatlxh:146:31 execute/runScript/<@https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=07zvr6j:161:274 jQuery.Callbacks/fire@https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=07zvr6j:45:104 jQuery.Callbacks/self.add@https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=07zvr6j:45:656 .Deferred/promise.always@https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=07zvr6j:46:865 execute/runScript@https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=07zvr6j:161:144 execute/</checkCssHandles@https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=07zvr6j:161:974 execute@https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=07zvr6j:162:681 mw.loader.implement@https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=07zvr6j:168:713 @https://de.wikipedia.org/w/load.php?debug=false&lang=de&modules=ext.echo.controller%2Cdm%2Clogger%2Cui%7Cext.echo.styles.notifications%7Cext.echo.ui.desktop%7Cmoment%2Coojs-ui-core%2Coojs-ui-widgets%7Coojs-ui-core.styles%7Coojs-ui.styles.icons%2Cicons-alerts%2Cicons-content%2Cicons-interactions%2Cicons-moderation%2Cicons-user%2Cindicators%2Ctextures%7Cschema.EchoInteraction&skin=vector&version=0eatlxh:96:239
Same with debug=1:
TypeError: moment is undefined de.js:29:5 <anonymous> de.js:29 <anonymous> de.js:12 <anonymous> de.js:6