[MetaCRS] [Proj4js] Problem with custom projection in OpenLayers

[Scott Odle]

I'm using OpenLayers 2 with Proj4JS 1.10. When trying to change the map's
projection using

Proj4js.defs['STEREOGRAPHIC:180,90'] = "+proj=stere +lat_0=90
+lon_0=180 +a=3396190.0 +b=3396190.0 +over=F +geoc=T";
map.baseLayer.projection.proj = new Proj4js.Proj('STEREOGRAPHIC:180,90');

and then zooming in to refresh the map, I get a JavaScript error tracing
back to the Graticule control: Uncaught TypeError: Cannot read property 'x'
of null.

Is there an issue with my proj4 string or could this be a bug with
OpenLayers or Proj4JS?

Thanks,

Scott Odle
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