Mr Tom Blakemore, of GH Porter Provisions, is facing a bill of thousands of pounds to replace the smashed window.
The owner of one of Newark's most well-known shops has said that continued vandalism could put him out of business.
Mr Tom Blakemore, who owns GH Porter Provisions on the corner of Newark Market Place and Bridge Street, is facing a bill of thousands of pounds to replace the store's main window, which was smashed overnight on Monday.
Staff arrived on Tuesday morning to find police were already aware of the incident, as they had put a note through the door.
Tom said he found a piece of a beer glass inside the shop, so he guessed that had been used to break the window. Nothing was stolen.
"It was just malicious vandalism," he said.
The window measures 3m by 2 1/2m.
"It won't be easy to replace because its not a standard piece of glass," Tom said. "This is a listed building and the mouldings around the window are old."
Tom is in the process of checking if his insurance covers the damage, but fears it may not.
"To be honest, this could bankrupt me," he said.
He said the vandalism was the latest in a series of incidents to blight the shop and the market place in general.