NPE in `TrStepped`

See #3840, release log:

• e80f520 by @yegor256: Merge pull request #3855 from ...
• 6a85eb9 by @volodya-lombrozo: feat(#3840): fix all the code ...
• 77cdf87 by @volodya-lombrozo: feat(#3840): sync access to th...
• 795e16d by @volodya-lombrozo: feat(#3840): add Once class
• 8c0fac8 by @volodya-lombrozo: feat(#3840): identify concurre...
• 10a006b by @volodya-lombrozo: feat(#3840): add a unit test f...
• a0c3048 by @yegor256: codecov-action v5
• 892a6db by @yegor256: @author and @Version removed
• 31c194e by @yegor256: Merge pull request #3849 from ...
• 23ac779 by @yegor256: #3847: fix
• 6c6cae8 by @yegor256: Merge pull request #3850 from ...
• 6b6ba6b by @yegor256: Merge pull request #3789 from ...
• 0014a9c by @yegor256: #3847: more
• 2a9b19d by @asmirnov-backend: refactor tests for EONumber
• cccff19 by @asmirnov-backend: fix lint errors | refactor: us...
• 5636f3e by @asmirnov-backend: fix PMD errors | refactor: use...
• c33477f by @asmirnov-backend: Use Expect in EOnumber$EOfloor
• 16dcd8f by @asmirnov-backend: Use Expect in EOnumber$EOgt
• 25d918b by @asmirnov-backend: Use Expect in EOnumber$EOdiv
• 5eabfad by @asmirnov-backend: Use Expect in EOnumber$EOas_i6...
• and 59 more...

Released by Rultor 2.0-SNAPSHOT, see build log