diff --git a/jme3-core/src/main/java/com/jme3/material/ShaderGenerationInfo.java b/jme3-core/src/main/java/com/jme3/material/ShaderGenerationInfo.java
index 8efc56679..dda02c67c 100644
--- a/jme3-core/src/main/java/com/jme3/material/ShaderGenerationInfo.java
+++ b/jme3-core/src/main/java/com/jme3/material/ShaderGenerationInfo.java
@@ -196,7 +196,7 @@ public class ShaderGenerationInfo implements Savable, Cloneable {
         clone.fragmentUniforms = new ArrayList<>();
         clone.fragmentGlobals = new ArrayList<>();
         clone.unusedNodes = new ArrayList<>();
-
+        clone.varyings = new ArrayList<>();
 
         for (ShaderNodeVariable attribute : attributes) {
             clone.attributes.add(attribute.clone());
@@ -208,7 +208,6 @@ public class ShaderGenerationInfo implements Savable, Cloneable {
 
         clone.vertexGlobal = vertexGlobal.clone();
 
-
         for (ShaderNodeVariable varying : varyings) {
             clone.varyings.add(varying.clone());
         }