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Sorry, I can't say what I was doing. The NPE occured occasionaly when I was moving the cursor over SourceEditor and from/to Debugger View (?) during debugging session. Maybe you can find out something from the stacktrace.
Created attachment 3126 [details] Stacktraces
*** Issue 16934 has been marked as a duplicate of this issue. ***
*** Issue 17013 has been marked as a duplicate of this issue. ***
Unable to display debugger tooltips in the editor, NPE thrown: -> P1
fixed in main trung & release33_beta2 - I can not reproduce this bug now, so verify it carefully, please
It seems to work in release33_beta2 build 200110291616.
Resolved for 3.3.x or earlier, no new info since then -> closing.