getId() in https://github.com/jenkinsci/mashup-portlets-plugin/blob/2f5d5a2cfa742e65d9e2a51912d6cc6493e72f07/src/main/java/javagh/jenkins/mashupportlets/GenericJsPortlet.java#L27 contains now a dash which is not a valid variable/function name in JS
fixed in https://github.com/jenkinsci/mashup-portlets-plugin/commit/cf960bb02f50711df6b80dffa2619b623421fe73