fixes in get_incoming_rate
diff --git a/stock/utils.py b/stock/utils.py
index e05e07a..e7702a8 100644
--- a/stock/utils.py
+++ b/stock/utils.py
@@ -82,7 +82,7 @@
return 0.0
previous_stock_queue = json.loads(previous_sle.get('stock_queue', '[]'))
in_rate = previous_stock_queue and \
- get_fifo_rate(previous_stock_queue, args.get("qty")) or 0
+ get_fifo_rate(previous_stock_queue, args.get("qty") or 0) or 0
elif valuation_method == 'Moving Average':
in_rate = previous_sle.get('valuation_rate') or 0
return in_rate