Exceptions are not thrown and program just keeps on running...

Dear IntelliJ-Community,

 A am currently developing a program that checks upon some data at a regular interval using a ScheduledExecutorService and the scheduleAtFixedRate method.

Now whenever the program encounters a Exception inside the new Thread.run() stack, IntelliJ tells me the program is still running and fails to throw the error message

I even tried to cause a trival NullPointerException like:

Object o = null;

boolean b = o.equals(null);

//And still the same problem occoured

Did anyone ever encounter a similar problem ?

I tried to activate breakpoints at uncaught exceptions but it did not help either

Does anyone have a clue what I could do to fix this?