1 files changed, 1 insertions, 0 deletions
diff --git a/pattern.js b/pattern.js
index 6b15fac..14ad005 100644
--- a/pattern.js
+++ b/pattern.js
@@ -45,6 +45,7 @@ const updatePreset = () => {
 
 patternLength.onchange = () => {
   length = +patternLength.value;
+  if (!length || length < 4) length = 4;
   pattern = pattern.filter(n => n < length);
   update();
 };