TypeError: Cannot read property 'undefined' of undefined at getFilter

[emilos]

price.html

<translation pl>{product.prices.PLN | monetize({ symbol: 'zł', separator: ',' })}</translation>
<translation de>{product.prices.EUR | monetize({ symbol: '€', separator: '.', ending: false, space: false })}</translation>
<translation en>{product.prices.GBP | monetize({ symbol: '£', separator: '.', ending: false, space: false })}</translation>

usage:

<import price from="components/product/price.html"/>

<price {product} />

error:

TypeError: Cannot read property 'undefined' of undefined at getFilter (/Users/emilos/Desktop/Projects/buxlabs/buxus-app/node_modules/boxwood/src/utilities/filters.js:125:22) at /Users/emilos/Desktop/Projects/buxlabs/buxus-app/node_modules/boxwood/src/Renderer.js:129:24 at Array.forEach (<anonymous>) at Renderer.render (/Users/emilos/Desktop/Projects/buxlabs/buxus-app/node_modules/boxwood/src/Renderer.js:128:23) at async generate (/Users/emilos/Desktop/Projects/buxlabs/buxus-app/node_modules/boxwood/src/compilers/html/Compiler.js:22:50) at async Compiler.compile (/Users/emilos/Desktop/Projects/buxlabs/buxus-app/node_modules/boxwood/src/Compiler.js:17:20) at async compileFile (/Users/emilos/Desktop/Projects/buxlabs/buxus-app/node_modules/express-boxwood/index.js:24:44) at async View.render [as engine] (/Users/emilos/Desktop/Projects/buxlabs/buxus-app/node_modules/express-boxwood/index.js:35:24)