There are two kinds of bugs: the rare, tricky race conditions and the everyday “oh shucks” ones. The rare ones show up maybe 1% of the time—they demand a debugger, careful tracing, and detective work. The “oh shucks” kind where I am half sure what it is when I see the shape of the exception message from across the room - that is all the rest of the time. A simple print statement usually does the trick for this kind.
Leave us be. We know what we’re doing.