X-Git-Url: http://nitlanguage.org

diff --git a/src/model_viz.nit b/src/model_viz.nit
index b89e549..ba851e8 100644
--- a/src/model_viz.nit
+++ b/src/model_viz.nit
@@ -216,6 +216,7 @@ class MProjectDot
 		# Collect interessing nodes
 		for m in model.mmodules do
 			# filter out modules outside wanted projects
+			if m.mgroup == null then continue
 			if not mprojects.has(m.mgroup.mproject) then continue
 
 			mmodules.add(m)