Fix ClassCastException when debug logging enabled

The debug logging code puts a null reference into a list,
then tries to cast it to a WGLGLCapabilities object.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java b/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java
index a66d62485..40271d284 100644
--- a/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java
+++ b/src/jogl/classes/com/jogamp/opengl/impl/windows/wgl/WindowsWGLGraphicsConfigurationFactory.java
@@ -153,7 +153,10 @@ public class WindowsWGLGraphicsConfigurationFactory extends GLGraphicsConfigurat
         int numFormats = pformats.length;
         ArrayList bucket = new ArrayList(numFormats);
         for (int i = 0; i < numFormats; i++) {
-            bucket.add( WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(glProfile, hdc, pformats[i], onscreen) );
+            WGLGLCapabilities wglglcapabilities = WindowsWGLGraphicsConfiguration.PFD2GLCapabilities(glProfile, hdc, pformats[i], onscreen);
+            // formats that don't draw to a window come back null; don't add them or they'll crash debug output
+            if( wglglcapabilities != null )
+                bucket.add( wglglcapabilities );
         }
         return bucket;
     }