Syntax errors

[Jamesking56]

When SSH'ing into my Ubuntu 20.04 server with zsh, antigen and this bundle:

expr: syntax error: missing argument after ‘-’
expr: syntax error: missing argument after ‘-’
/home/jamesking56/.antigen/bundles/unixorn/autoupdate-antigen.zshplugin/autoupdate-antigen.zsh:[:49: unknown condition: -gt
/home/jamesking56/.antigen/bundles/unixorn/autoupdate-antigen.zshplugin/autoupdate-antigen.zsh:[:58: unknown condition: -gt