FranckR

In ps_orders check the value of convertion_rate column not id_currency

Yes the problem was for editing customers : Back office / customers / customers the error 500 on some customers ( that had old orders ) I know it doesn't display the orders on the customer form but I think prestashop is requesting them anyway

Hi, I had the same problem The issue was the column "convertion_rate" in the ps_orders table I guess in prestashop prior to 1.7.6.0 if you had only one currency the conversion rate wasn't mandatory but now it is and should be > 0.000000 So I updated the column convertion_rate in table ps_orders with '1.000000' by using the following SQL request : DO A BACKUP OF YOUR DATABASE BEFORE !!! AND IF YOUR USING MULTI CURRENCIES ON YOUR SHOP IT MIGHT MESS THINGS UP AND YOU SHOULD MAYBE ONLY UPDATE THE LINES WHERE IT'S 0,000000 UPDATE ps_orders SET conversion_rate = '1.000000' Hope this can help