Can't add new invoice from Customer window

Can't add new invoice from Customer window

Add a new customer. After saving that customer page, the sections below show up, products, invoices, contacts, etc...

Each section has a button above it for adding a new item. The button above Invoices says "New". Clicking this button throws the following error, which needs to fixed immediately since now adding an invoice to a customer is more of a hassle:


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