NPE when cause is null in https://github.com/beanshell/beanshell/blob/merge-fork-beanshell2/src/main/java/bsh/TargetError.java#L75 due to https://github.com/beanshell/beanshell/blob/merge-fork-beanshell2/src/main/java/bsh/TargetError.java#L94 I would suggest to check for cause != null in getMessage(),
