Lego may not be able to make enough plastic bricks to meet demand this Christmas, meaning some children won't find what they are looking for in their stockings.
Despite Lego's factories running at full speed, failure to accurately forecast demand means that some orders may not be completed in time for the festive period.
In a statement, Lego spokesman Roar Trangbaek said:
We will not be able to deliver all of the orders coming from customers in the remainder of the year.
Due to the popularity of films such as The Lego Movie, the Danish company has become the world's largest toy-maker by sales.
In the first half of this year alone, their sales grew by 18 percent.
The company have previously experienced some supply difficulties - last year in Denmark and Canada - but this year's shortages are expected to affect other parts of Europe.
The company is currently building a factory in Jiaxing, China, which is expected to be up and running in 2017 which is set to become the main producer in Asia.