ayuda query, Facturado y Pagos por descripcion de Producto

Que tal Amigos, aprovechandome nuevamente de su buena Fe, quisiera ver si alguien puede echarme la mano, con este query, ya que me da un error (Divide by zero error encountered.) al Momento de Dividir por el MAXIMO del conteo de Lineas en el detalle de la factura, este error es el que arroja, y no he podido pasar de ahi,

ojala pudieran apoyarme, les agradezco de antemano.

DECLARE @FECHAINI DATETIME, @FECHAFIN DATETIME

SET @FechaIni = '2013-05-01'

SET @FechaFin = '2013-05-30'

SELECT distinct F1.cardcode, F1.cardname,

ISNULL((select sum(A0.linetotal) as 'FACTURADO'

from INV1 A0

join OINV t1 on A0.docentry = t1.docentry

where A0.dscription like 'PAPA %' and T1.cardcode = F1.cardcode and t1.docdate between @fechaiNI and @Fechafin

group by t1.cardcode),0) as 'FACTURADO',

ISNULL((select DISTINCT 'PRUEBA' = CASE

WHEN COUNT(A0.Linenum) > '0' THEN SUM(A0.linetotal) / MAX(A0.linenum)

WHEN COUNT(A0.linenum) = '1' THEN SUM(T3.DOCTOTAL) END

from INV1 A0

join OINV t1 on A0.docentry = t1.docentry

join RCT2 T2 on T1.docentry = T2.docentry

join ORCT T3 on T2.docnum = T3.docnum

where A0.dscription like 'PAPA %' and T1.cardcode = F1.cardcode and t1.docdate between @fechaiNI and @Fechafin

group by t1.cardcode),0) as 'PAGOS'

FROM OCRD F1

WHERE ISNULL((select sum(A0.linetotal) as 'FACTURADO'

from INV1 A0

join OINV t1 on A0.docentry = t1.docentry

where A0.dscription like 'PAPA %' and T1.cardcode = F1.cardcode and t1.docdate between @fechaiNI and @Fechafin

group by t1.cardcode),0) > '0'

GROUP BY f1.cardcode, f1.cardname

order by 'PAGOS' DESC