diff --git a/src/main/java/featurecat/lizzie/analysis/EngineManager.java b/src/main/java/featurecat/lizzie/analysis/EngineManager.java
index 3d93fb959..a5a74a5ee 100644
--- a/src/main/java/featurecat/lizzie/analysis/EngineManager.java
+++ b/src/main/java/featurecat/lizzie/analysis/EngineManager.java
@@ -172,6 +172,9 @@ public void refresh() throws JSONException, IOException {
                             i -> {
                               String cmd = m.optString(i);
                               int index = i + 1;
+                              while (engineList.size() < index + 1) {
+                                engineList.add(null);
+                              }
                               if (index != currentEngineNo) {
                                 updateEngine(
                                     index,