fix out-of-bounds array index access

[szsam]

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[Cyan4973]

That's a good starting point !

Looking a bit more into it, if execution reaches this code path with idx == inSeqsSize,
it is probably better to return an error, because it means that input is invalid.
In contrast, current proposed fix just skips the if () {...} code block, and still returns a success, as if everything was fine.