1 files changed, 3 insertions, 0 deletions
diff --git a/src/classes/com/sun/opengl/impl/windows/WindowsExternalGLDrawable.java b/src/classes/com/sun/opengl/impl/windows/WindowsExternalGLDrawable.java
index 68ab83161..23ec0a1fc 100755
--- a/src/classes/com/sun/opengl/impl/windows/WindowsExternalGLDrawable.java
+++ b/src/classes/com/sun/opengl/impl/windows/WindowsExternalGLDrawable.java
@@ -46,6 +46,9 @@ public class WindowsExternalGLDrawable extends WindowsGLDrawable {
   public WindowsExternalGLDrawable() {
     super(new GLCapabilities(), null);
     hdc = WGL.wglGetCurrentDC();
+    if (hdc == 0) {
+      throw new GLException("Error: attempted to make an external GLDrawable without a drawable/context current");
+    }
   }
 
   public GLContext createContext(GLContext shareWith) {