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13:40:47-03/03 zebraidx(3905) [log] Records: 57000 i/u/d 10/56990/0
13:40:53-03/03 zebraidx(3905) [log] Records: 58000 i/u/d 19/57981/0
13:40:58-03/03 zebraidx(3905) [log] Records: 59000 i/u/d 28/58972/0
13:41:11-03/03 zebraidx(3905) [log] Merge 14.0% completed; 61 seconds remaining
13:41:21-03/03 zebraidx(3905) [log] Merge 40.3% completed; 29 seconds remaining
13:41:31-03/03 zebraidx(3905) [log] Merge 57.6% completed; 22 seconds remaining
13:41:41-03/03 zebraidx(3905) [log] Merge 59.6% completed; 27 seconds remaining
13:41:51-03/03 zebraidx(3905) [log] Merge 70.0% completed; 21 seconds remaining
13:42:01-03/03 zebraidx(3905) [log] Merge 76.0% completed; 18 seconds remaining
13:42:11-03/03 zebraidx(3905) [log] Merge 81.4% completed; 16 seconds remaining
13:42:21-03/03 zebraidx(3905) [log] Merge 87.3% completed; 11 seconds remaining
13:42:27-03/03 zebraidx(3905) [fatal] Bad block size -8 in pos=511075
zebraidx: isamb.c:549: open_block: Assertion `p->size >= 0' failed.
====================
CLEANING
====================
I checked for any changes in settings found no changes at all.
Need your help.