Closure minimize parse error

Hi,

on our testing server we get the following error:

... JSC_PARSE_ERROR. Parse error. getters are not supported in older 
versions of JavaScript. If you are targeting
newer versions of JavaScript, set the appropriate language_in option. at 
StreamableResource<text/javascript 
classpath:META-INF/assets/js/pdfjs/build/compatibility.js COMPRESSABLE 
lastModifi
ed: Mon Mar 12 15:20:19 CET 2018 size: 50791> line 1732 : 0.
        at 
org.apache.tapestry5.internal.webresources.GoogleClosureMinimizer.doMinimize(GoogleClosureMinimizer.java:97)
        at 
org.apache.tapestry5.internal.webresources.AbstractMinimizer$1.perform(AbstractMinimizer.java:72)
        at 
org.apache.tapestry5.internal.webresources.AbstractMinimizer$1.perform(AbstractMinimizer.java:68)
        at 
org.apache.tapestry5.ioc.internal.OperationTrackerImpl.perform(OperationTrackerImpl.java:110)
        at 
org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.perform(PerThreadOperationTracker.java:84)
        at 
org.apache.tapestry5.ioc.internal.RegistryImpl.perform(RegistryImpl.java:1266) 
... It does not occur when running the same application on my local 
machine in a Tomcat (same as on server).

Any idea what could be the problem here?
If no fix can be found, is there a way to tell Tapestry to not minimize 
this specific file to maybe get it working that way?


Nathan