Problem with Quantity Buttons

Hi,

when i click on the Plus and Minus buttons, nothing happens. I then look at the errors and see:

Uncaught TypeError: f.getDecimals is not a function(anonymous function) @ wc-quantity-increment.min.js?ver=4.5.3:1dispatch @ jquery.js?ver=1.12.4:3r.handle @ jquery.js?ver=1.12.4:3

Hope you can assist.

thanks!

https://wordpress.org/plugins/woocommerce-quantity-increment/