diff --git a/mastodonCzStats.js b/mastodonCzStats.js
index 5d2ced1..f5d71e5 100755
--- a/mastodonCzStats.js
+++ b/mastodonCzStats.js
@@ -49,9 +49,9 @@ function gitCommit(files, des= "not specified"){
 }
 async function* collectStats(instances, weeks = 1) {
 	for(const instance of instances){
-		const { stats, mau, user_count }= await fetchInstanceStats(instance).catch(e=> ({}));
-		if(!stats || !Array.isArray(stats)) continue;
-		yield { instance, mau, user_count, ...sumStats(stats.slice(0, weeks + 1)) };
+		const { stats, mau, user_count }= await fetchInstanceStats(instance).catch(_=> ({}));
+		if(!stats || !Array.isArray(stats) || !stats.length) continue;
+		yield { instance, mau, user_count, ...sumStats(stats.slice(0, Math.min(stats.length, weeks + 1))) };
 	}
 }
 function sumStats(arr) {