bug with font family css

Freshly installed copy of DW Promobar.

I haven’t changed the font settings at all but I tried to update the background color and it didn’t work.

Looking in the code I have this:

@font-face {

        font-family: "0";
        src: url('<br />
<b>Notice</b>:  Undefined offset: 1 in <b>/var/sites/d/clientname.co.uk/public_html/wp-content/plugins/dw-promobar/dw-promobar.php</b> on line <b>133</b><br />
');
      }
			#dwpb {
				font-family: 0;
			}

It probably doesn’t show up for most as they are installing it on a production website but during dev I have debug mode on to root out any coding errors I’ve made.

https://wordpress.org/plugins/dw-promobar/