how to make this variable work in social groups and album pages

[Super Jinni]

I wanted the title of social group and album be shown under the navbar, so I added the variable $custompagetitle to the the end of the navbar with if condition, but that didn't work at all and nothing showed, but if I add the variable $pagetitle it works fine but it doesn't show the exact title that I want it to be shown.

how to make that work?

thanks.