After your suggestions I've cleaned all the debugger tables:
USE cr_debug;
SELECT * FROM breakpoints b;
SELECT * FROM callstack c;
DELETE FROM callstack;
DELETE FROM breakpoints;
SELECT * FROM debuggings d;
DELETE FROM cr_debug.debuggings;
SELECT * FROM watches w;
DELETE FROM watches;
SELECT * FROM dual d;
DELETE FROM dual;
ASKER
After your suggestions I've cleaned all the debugger tables:
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And now everything is fine.