diff --git a/index.ts b/index.ts
index c594329..86e5f6e 100644
--- a/index.ts
+++ b/index.ts
@@ -19,11 +19,11 @@ const openai = new OpenAI({
 
 // #region util
 
-/** pick random N elements from array.
- *  just shuffle it if N is unspecified.
+/** pick up to random N elements from array.
+ *  just shuffle it if N is unspecified or greater than the length of the array.
  *  the original array remains unmodified. */
 function sample<T>(arr: T[], n: number = arr.length): T[] {
-  if (n > arr.length) throw new Error("sample: N out of range");
+  if (n > arr.length) return sample(arr, arr.length);
   const copy = [...arr];
   for (let i = 0; i < n; i++) {
     const j = i + Math.floor(Math.random() * (copy.length - i));
@@ -42,15 +42,13 @@ const sleep = (msec: number) =>
 const me = await misskey.request("i", {});
 
 const isSuitableAsInput = (n: Note) =>
-  !n.user.isBot && !n.replyId && (!n.mentions || n.mentions.length === 0)
+  !n.user.isBot && !n.replyId && (!n.mentions || n.mentions.length === 0) && n.text?.length && n.text.length > 0
 
 /** randomly sample some notes from the timeline */
 async function getNotes() {
   // randomly sample N local notes
   async function getLocalNotes(count: number) {
     const timeline = await misskey.request("notes/local-timeline", {
-      withFiles: false,
-      withRenotes: false,
       limit: 100,
     });
     // exclude bot notes
@@ -60,8 +58,6 @@ async function getNotes() {
   // randomly sample N global notes
   async function getGlobalNotes(count: number) {
     const timeline = await misskey.request("notes/global-timeline", {
-      withFiles: false,
-      withRenotes: false,
       limit: 100,
     });
     // exclude bot notes and replies
@@ -73,7 +69,6 @@ async function getNotes() {
     const notes = await misskey.request("users/notes", {
       userId: me.id,
       limit: 100,
-      withRenotes: false,
     });
     return sample(notes, count);
   }
@@ -262,6 +257,7 @@ async function runJob() {
         console.log("* job complete");
       } catch (e) {
         console.log(`* error: ${e}`);
+        if (e instanceof Error) console.log(e.stack);
       }
     }
     await sleep(1000); // 1sec
@@ -289,6 +285,7 @@ async function main() {
       await Promise.all([runJob(), pushJob()]);
     } catch (e) {
       console.error(e);
+      if (e instanceof Error) console.log(e.stack);
     }
   } finally {
     disposeStream();