rizin | like reverse engineering framework and command-line toolset | Reverse Engineering library

There are a few things to fix here. Firstly, your links are considered factors (you can see this with testLinks %>% sapply(class), so you'll need to convert them to character using as.chracter() I've done this in the code below.

Secondly, you need to assign each scrape to a list element, so we create a list outside the loop with events <- list(), and then assign each scrape to an element of the list inside the loop i.e. events[[i]] <- "something" Without a list, you'll simply override the first scrape with the second, and the second with the third, and so on.

Now your tryCatch will work and assign NA when a url does not contain a table (there will be no error)