Steps to reproduce:

Debug it:

self halt.

Inspect the Debugger model and do it:

(RunArray runs: #(2 1 1 3 3 2 1 4) values: #(#stepInto #stepOver #stepInto #stepOver #stepInto #stepOver #stepInto #stepOver)) do: [:each | self in: each].

Expected behavior: The debugger shows the last step of UnhandledError class>>signalForException:.

Actual behavior: A second debugger appears on the same process, showing UndefinedObject(Object)>>halt.

Notes: None of my two proposals on how to fix the infinite debugger chainshttp://forum.world.st/I-broke-the-debugger-tp5110752p5110814.html affects this behavior. There must be some other magic ...

Best, Christoph