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    <p>Here's my solution using <code>try</code> to a similar problem with the Twitter API. </p> <p>I was asking the Twitter API for the number of followers for each person in a long list of Twitter users. When a user has their account protected I would get an error and the loop would break before I put in the <code>try</code> function. Using <code>try</code> allowed the loop to keep working by skipping onto the next person on the list.</p> <p>Here's the setup</p> <pre><code># load library library(twitteR) # # Search Twitter for your term s &lt;- searchTwitter('#rstats', n=1500) # convert search results to a data frame df &lt;- do.call("rbind", lapply(s, as.data.frame)) # extract the usernames users &lt;- unique(df$screenName) users &lt;- sapply(users, as.character) # make a data frame for the loop to work with users.df &lt;- data.frame(users = users, followers = "", stringsAsFactors = FALSE) </code></pre> <p>And here's the loop with <code>try</code> to handle errors while populating users$followers with follower counts obtained from Twitter API</p> <pre><code>for (i in 1:nrow(users.df)) { # tell the loop to skip a user if their account is protected # or some other error occurs result &lt;- try(getUser(users.df$users[i])$followersCount, silent = TRUE); if(class(result) == "try-error") next; # get the number of followers for each user users.df$followers[i] &lt;- getUser(users.df$users[i])$followersCount # tell the loop to pause for 60 s between iterations to # avoid exceeding the Twitter API request limit print('Sleeping for 60 seconds...') Sys.sleep(60); } # # Now inspect users.df to see the follower data </code></pre>
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