Sales order submission creating problem

Hi.
I need urgent help. When I try to accept or submit the sales order, it is creating a major problem. It is not able to save the doctype.
Here is the error log:
Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/save.py”, line 22, in savedocs
doc.save()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 259, in save
return self._save(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 293, in _save
self.run_before_save_methods()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 861, in run_before_save_methods
self.run_method(“validate”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 757, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1026, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1009, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 751, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/selling/doctype/sales_order/sales_order.py”, line 30, in validate
super(SalesOrder, self).validate()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/selling_controller.py”, line 37, in validate
super(SellingController, self).validate()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/stock_controller.py”, line 17, in validate
super(StockController, self).validate()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/accounts_controller.py”, line 40, in validate
self.set_missing_values(for_validate=True)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/selling_controller.py”, line 50, in set_missing_values
self.set_price_list_and_item_details(for_validate=for_validate)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/selling_controller.py”, line 78, in set_price_list_and_item_details
self.set_missing_item_details(for_validate=for_validate)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/accounts_controller.py”, line 206, in set_missing_item_details
ret = get_item_details(args)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/get_item_details.py”, line 44, in get_item_details
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/get_item_details.py”, line 261, in get_basic_details
“amount”: 0.0,
TypeError: can’t multiply sequence by non-int of type ‘float’

Traceback (most recent call last):
File “/home/frappe/frappe-bench/apps/frappe/frappe/app.py”, line 62, in application
response = frappe.handler.handle()
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 22, in handle
data = execute_cmd(cmd)
File “/home/frappe/frappe-bench/apps/frappe/frappe/handler.py”, line 53, in execute_cmd
return frappe.call(method, **frappe.form_dict)
File “/home/frappe/frappe-bench/apps/frappe/frappe/init.py”, line 939, in call
return fn(*args, **newargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/save.py”, line 22, in savedocs
doc.save()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 259, in save
return self._save(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 293, in _save
self.run_before_save_methods()
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 861, in run_before_save_methods
self.run_method(“validate”)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 757, in run_method
out = Document.hook(fn)(self, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1026, in composer
return composed(self, method, *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 1009, in runner
add_to_return_value(self, fn(self, *args, **kwargs))
File “/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py”, line 751, in
fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/selling/doctype/sales_order/sales_order.py”, line 30, in validate
super(SalesOrder, self).validate()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/selling_controller.py”, line 37, in validate
super(SellingController, self).validate()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/stock_controller.py”, line 17, in validate
super(StockController, self).validate()
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/accounts_controller.py”, line 40, in validate
self.set_missing_values(for_validate=True)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/selling_controller.py”, line 50, in set_missing_values
self.set_price_list_and_item_details(for_validate=for_validate)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/selling_controller.py”, line 78, in set_price_list_and_item_details
self.set_missing_item_details(for_validate=for_validate)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/controllers/accounts_controller.py”, line 206, in set_missing_item_details
ret = get_item_details(args)
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/get_item_details.py”, line 44, in get_item_details
File “/home/frappe/frappe-bench/apps/erpnext/erpnext/stock/get_item_details.py”, line 261, in get_basic_details
“amount”: 0.0,
TypeError: can’t multiply sequence by non-int of type 'float