[amibroker] Why does this IF error ?

["gmorlosky" <gmorlosky@xxxxxxxxx>]

I get an error about not being numeric for line # 2 below which I // out. Why is "if (fc > 20)" not valid ?

 fc = Foreign( symbol, "C" );
// if (fc > 20)
  if( ! IsNull( fc[ 0 ] ) )
  {
    Plot( 100 * ( fc - fc[ fvb ] )/ fc[ fvb ], symbol, colorLightOrange + ( (2*i) % 15 ), styleLine );
  }
// }



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