PHP Notice: Undefined offset: 1

Psst. Unless have utterly and completely modified the database to rid it of its history, the database "history" can be found when clicking the version link in the admin. After seeing several of the "settings" the history for that database can be found.

Huh, and I was going to suggest that this might be one of those conditions where it may actually be good to have logs generated because of the relatively limited expectation of just clearing database entries "because" and it possibly being a "marker" that someone has done something undesirable. But, then again, why let someone else cause a problem with the store just because they found some "issue"... :)

Ah well. :P thanks to those that identified an issue. For others, seems it may still be good to identify how this issue was risen...

Well, you learn something new everyday! Thanks, mc12345678. FWIW here's the database version history:
Zen Cart 1.5.7c
Database Patch Level: 1.5.7
v1.5.7 [2020-10-09 10:23:35] (Version Update 1.5.6->1.5.7)
v1.5.6c [2020-10-09 10:23:34] (Version Update 1.5.5->1.5.6c)
v1.5.5f [2019-01-21 07:46:06] (Version Update 1.5.4->1.5.5f)
v1.5.4 [2019-01-21 07:46:05] (Version Update 1.5.3->1.5.4)
v1.5.3 [2019-01-21 07:46:05] (Version Update 1.5.2->1.5.3)
v1.5.2 [2019-01-21 07:46:04] (Version Update 1.5.1->1.5.2)
v1.5.1 [2019-01-21 07:46:03] (Version Update 1.5.0->1.5.1)
v1.5.0 [2012-06-14 15:20:17] (Fresh Installation)
v1.5.0 [2012-06-14 15:20:17] (Fresh Installation)

And thank you Dr. Byte!