diff --git a/main.go b/main.go
index 81c9d22..f8da0b2 100644
--- a/main.go
+++ b/main.go
@@ -121,23 +121,32 @@ func newHandlerGetAPIV1RPCAIEvent(cfg Config) http.HandlerFunc {
 			if err != nil {
 				return err
 			}
+			if len(threads) == 0 {
+				return nil
+			}
 
-			prompt := fmt.Sprintf("Summarize the Slack thread in 1 sentence. List any suggested follow ups.\n\n---\n\n")
 			for _, thread := range threads {
+				prompt := fmt.Sprintf("Summarize the Slack thread in 1 sentence. List any suggested follow ups.\n\n---\n\n")
+
 				messages, err := cfg.storage.GetThreadMessages(ctx, thread.ID)
 				if err != nil {
 					return err
 				}
+				if len(messages) == 0 {
+					continue
+				}
+
 				for _, message := range messages {
 					prompt += fmt.Sprintf("%s\n%s\n\n", message.Author, message.Plaintext)
 				}
+
+				summary, err := cfg.ai.Do(ctx, prompt)
+				if err != nil {
+					return err
+				}
+				threadSummaries = append(threadSummaries, summary)
 			}
 
-			summary, err := cfg.ai.Do(ctx, prompt)
-			if err != nil {
-				return err
-			}
-			threadSummaries = append(threadSummaries, summary)
 			return nil
 		}(r.Context()); err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)