synchronizedList must be in a synchronized block when iterating

src/main/java/appeng/client/me/ItemRepo.java

@@ -67,11 +67,12 @@ public class ItemRepo {
 
     public IAEItemStack getReferenceItem(int idx) {
         idx += this.src.getCurrentScroll() * this.rowSize;
-
-        if (idx >= this.view.size()) {
-            return null;
+        synchronized (this.view) {
+            if (idx >= this.view.size()) {
+                return null;
+            }
+            return this.view.get(idx);
         }
-        return this.view.get(idx);
     }
 
     void setSearch(final String search) {
@@ -209,7 +210,9 @@ public class ItemRepo {
 
             return view;
         }).thenAcceptAsync(view -> {
-            this.view.clear();
+            synchronized (this.view) {
+                this.view.clear();
+            }
             this.view.addAll(view);
         }).thenRunAsync(() -> {
             this.searchTask = null; // Prevent redundant cancellation