Typo3 Upgrade 7.6.31 to 8.7.19 / Database Analyzer fails

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during the upgrade process from 7.6 to 8.7 the database Analyzer fails in the following statement: enter image description here

Error:

Database update failed

Error: Specified key was too long; max key length is 1000 bytes

can you help?

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Leo On BEST ANSWER

i found the solution.

 drop index lookup_string on sys_refindex;

then you can run database analyzer in to steps:

  1. ALTER TABLE ....
  2. CREATE INDEX .... but this is done by database analyzer in upgrade wizard