Oracle error - ORA-01476: divisor is equal to zero

Hi

I'm having a problem with a section of my Query. This is probably because i have NULL fields. So it can't calculate properly.

Because of that, i have this error:

ORA-01476: divisor is equal to zero
01476. 00000 -  "divisor is equal to zero"
*Cause:    
*Action:

How can i fix this so that i just calculate what i can?

Thanks agauin

  case
    when STOP_TYPE = 'DL' and INBOUND = 'N' -- OB POs
    then  TO_CHAR((((TOTAL_MILES - TOTAL_IB_MILES)/TOTAL_MILES) * (ORDER_WEIGHT/TOTAL_OB_WEIGHT)*FREIGHT_COST),'9,999.99')
    when STOP_TYPE = 'DL' and INBOUND = 'I' -- IB POs
    then  TO_CHAR(((TOTAL_IB_MILES/TOTAL_MILES) * (ORDER_WEIGHT/TOTAL_IB_WEIGHT)*FREIGHT_COST),'9,999.99')
    when STOP_TYPE = 'DL' and TOTAL_ELAPSED_TIME < '000:00' -- LTL loads
    then  TO_CHAR(((ORDER_WEIGHT/TOTAL_WEIGHT)*FREIGHT_COST),'9,999.99')
    END AS PO_RATE_PRORATION

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