diff --git a/core/src/processing/data/IntList.java b/core/src/processing/data/IntList.java
index afb4c6cd61..83cac6b3f7 100644
--- a/core/src/processing/data/IntList.java
+++ b/core/src/processing/data/IntList.java
@@ -6,6 +6,7 @@
 import java.util.Iterator;
 import java.util.Random;
 
+import org.jetbrains.annotations.TestOnly;
 import processing.core.PApplet;
 
 
@@ -164,13 +165,14 @@ public void clear() {
    * @webBrief Get an entry at a particular index
    */
   public int get(int index) {
-    if (index >= this.count) {
+    if (index >= this.count || index < 0) {
       throw new ArrayIndexOutOfBoundsException(index);
     }
     return data[index];
   }
 
 
+
   /**
    * Set the entry at a particular index.
    *