def on_change_indic_cost(self, cr, uid, ids, cost_ids, context=None):
totalsum = 0.0
for element in cost_ids:
- if element and len(element) == 3 and element[2]:
+ if element and len(element) == 3 and isinstance(element[2], dict):
totalsum += element[2].get('amount', 0.0)
return {
'value': {