An error in a web page displayed on a device is detected. The error is assigned to a bucket to indicate a type of the error, and a record describing the current state of the device is generated. Both an indication of the bucket and the record describing the current state of the device are then sent to a server. At the server, error information including error records and bucket identifiers are received from multiple devices. Each error record describes a current state of one of the multiple devices at a time when an error in a web page displayed on the one device was detected. Each bucket identifier corresponds to one of the error records and describes a type of the error associated with that error record. The error records are grouped into multiple baskets based at least in part on the current state information in the error records.