Topic on Extension talk:Semantic Glossary

MediaWiki	1.31.0
PHP	7.1.8 (apache2handler)
MySQL	5.6.34-log

Fatal error: Uncaught Error: Call to undefined function SG\wfProfileIn() in /app/mediawiki/extensions/SemanticGlossary/src/LingoBackendAdapter.php:58 Stack trace: #0 /app/mediawiki/extensions/Lingo/src/LingoParser.php(191): SG\LingoBackendAdapter->next() #1 /app/mediawiki/extensions/Lingo/src/LingoParser.php(163): Lingo\LingoParser->buildLingo() #2 /app/mediawiki/extensions/Lingo/src/LingoParser.php(223): Lingo\LingoParser->getLingoTree() #3 /app/mediawiki/extensions/Lingo/src/LingoParser.php(80): Lingo\LingoParser->realParse(Object(Parser), '

parse(Object(Parser), '

parse('

If you can, please use master for the moment.

See https://github.com/SemanticMediaWiki/SemanticGlossary/issues/41

Why Thank you, that seems to work fine. 
Will I be able to use composer for this version?

Composer should work. You just have to force it to use the master version.