Cordova-plugin-firebase: cordova prepare fails with this plugin

I'm getting this error message (cordova 8.0.0):

Preparing Firebase on Android
{ Error: ENOENT: no such file or directory, open 'platforms/android/res/values/strings.xml'
at Object.fs.openSync (fs.js:663:18)
at Object.fs.readFileSync (fs.js:568:33)
at updateStringsXml (/Users/rlz/projects/MenApp-cordova/plugins/cordova-plugin-firebase/scripts/after_prepare.js:57:22)
at copyKey (/Users/rlz/projects/MenApp-cordova/plugins/cordova-plugin-firebase/scripts/after_prepare.js:94:29)
at module.exports (/Users/rlz/projects/MenApp-cordova/plugins/cordova-plugin-firebase/scripts/after_prepare.js:139:5)
at runScriptViaModuleLoader (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/hooks/HooksRunner.js:188:18)
at runScript (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/hooks/HooksRunner.js:164:16)
at /usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/hooks/HooksRunner.js:132:20
at _fulfilled (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/node_modules/q/q.js:787:54)
at self.promiseDispatch.done (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/node_modules/q/q.js:816:30)