Graph/JOGL: Avoid NPE

1 files changed, 7 insertions, 1 deletions

diff --git a/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderState.java b/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderState.java
index a5290b958..e51998a87 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderState.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderState.java
@@ -942,7 +942,13 @@ public class ShaderState {
         }
         
         sb.append("ShaderState[ ");
-        sb.append(Platform.getNewline()).append(" ").append(shaderProgram.toString());
+        
+        sb.append(Platform.getNewline()).append(" ");
+        if(null != shaderProgram) {
+            shaderProgram.toString(sb);
+        } else {
+            sb.append("ShaderProgram: null");
+        }
         sb.append(Platform.getNewline()).append(" enabledAttributes [");
         for(Iterator<String> iter = enabledAttributes.iterator(); iter.hasNext(); ) {
             sb.append(Platform.getNewline()).append("  ").append(iter.next());