Check for value is N/A

I am integrating an API and in some cases bonus field return value N/A and I want not to show N/A on the page.If the field has any text other than N/A then it shows the text.

I tried this:

    if(trim($value) != "N/A" && !is_null($value))
    {
        echo $value;
    }

But the above condition is not working.

Can anyone help me to make it working.

Thanks in advance.