diff --git a/src/routes/voteOnSponsorTime.js b/src/routes/voteOnSponsorTime.js
index 6dbdb6c..5025fbb 100644
--- a/src/routes/voteOnSponsorTime.js
+++ b/src/routes/voteOnSponsorTime.js
@@ -266,7 +266,13 @@ module.exports = async function voteOnSponsorTime(req, res) {
         //for each positive vote, see if a hidden submission can be shown again
         if (incrementAmount > 0 && voteTypeEnum === voteTypes.normal) {
             //find the UUID that submitted the submission that was voted on
-            let submissionUserID = db.prepare("SELECT userID FROM sponsorTimes WHERE UUID = ?").get(UUID).userID;
+            let submissionUserID = db.prepare("SELECT userID FROM sponsorTimes WHERE UUID = ?").get(UUID)?.userID;
+
+            if (!submissionUserID) {
+                // They are voting on a non-existent submission
+                res.status("Voting on a non-existent submission").send(400);
+                return;
+            }
 
             //check if any submissions are hidden
             let hiddenSubmissionsRow = db.prepare("SELECT count(*) as hiddenSubmissions FROM sponsorTimes WHERE userID = ? AND shadowHidden > 0").get(submissionUserID);