Hundreds of Standard Life customers have been put in danger of becoming victims of fraud after the insurance company mistakenly released their sensitive financial information.

The error occurred when the investments division of Standard Life sent out the policy documents of its customers to the wrong addresses. Up to 300 people are believed to be affected, according to reports.

The insurance firm has begun writing to the customers involved apologising for the mistake and urging anyone holding the details of someone else to return it to the company.

“We are aware that there has been an individual error in systems employed for the production of contract notes by Standard Life Investments,” said a spokesperson in a statement. “We take data protection issues very seriously and have acted swiftly to make investors aware of the error and to increase our security controls. Every effort is being made to avoid any further disruption to our clients.”