Fix ShaderProgram double destroy()

1 files changed, 4 insertions, 2 deletions

diff --git a/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderProgram.java b/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderProgram.java
index 2f40363d6..565b5ab1c 100644
--- a/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderProgram.java
+++ b/src/jogl/classes/com/jogamp/opengl/util/glsl/ShaderProgram.java
@@ -95,8 +95,10 @@ public class ShaderProgram {
         }
         allShaderCode.clear();
         attachedShaderCode.clear();
-        gl.glDeleteProgram(shaderProgram);
-        shaderProgram=-1;
+        if(0<=shaderProgram) {
+            gl.glDeleteProgram(shaderProgram);
+            shaderProgram=-1;
+        }
     }
 
     //