Index out of bounds with specific block

[beta-ziliani]

When fetching the last block, number 951208, it failed with:

Unhandled exception: Index out of bounds (IndexError)
  from /usr/local/Cellar/crystal/1.13.2/share/crystal/src/string.cr:816:22 in '[]'
  from src/core/verkle_state.cr:16:43 in 'init_execution_witness'
  from src/core/verkle_state_manager.cr:29:7 in 'init_execution_witness'
  from src/dump_block.cr:18:5 in 'print_block'
  from src/dump_block.cr:43:5 in 'dump_block'