Syntax conflict

Hi,
I have a issue with a syntax tag. Always i try call the variable $supervisor.user_name the code understand the "or" as compare flag. This break the code.

{$supervisor.user_name}
Change to:
 `if(@$supervis||.user_name): 
To
`try{ echo @self::callModifier("contextOutTag",$supervisor['user_name'],""); } catch(\Exception $e) { echo $e->getMessage(); }