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

diff --git a/src/model/model_viz.nit b/src/model/model_viz.nit
index d516da7..06f2fb6 100644
--- a/src/model/model_viz.nit
+++ b/src/model/model_viz.nit
@@ -27,7 +27,7 @@ class MPackageTree
 
 	redef fun display(a) do
 		if a isa MGroup then
-			if a.parent == null then return "{a.mpackage.name} ({a.filepath.to_s})"
+			if a.parent == null then return "{a.mpackage.name} ({a.filepath or else "?"})"
 			return a.name + " (group)"
 		else if a isa MModule then
 			return a.name
@@ -85,7 +85,7 @@ private class LinexComparator
 		var subs = tree.sub[o]
 		var minres = mini(subs.first)
 		var maxres = maxi(subs.first)
-		var order = minres.model.mmodule_importation_hierarchy
+		var order = o.model.mmodule_importation_hierarchy
 		for o2 in subs do
 			var c = mini(o2)
 			if c == null then continue
@@ -165,7 +165,7 @@ class MPackageDot
 		if mgroup.parent == null then
 			# is is a root group, so display the package
 			if package_group then
-				o.write("subgraph cluster_{mgroup.object_id} \{\nlabel=\"{mgroup.mpackage.name}\\n({mgroup.filepath.to_s})\"\ncolor=black\nstyle=dotted\n")
+				o.write("subgraph cluster_{mgroup.object_id} \{\nlabel=\"{mgroup.mpackage.name}\\n({mgroup.filepath or else "?"})\"\ncolor=black\nstyle=dotted\n")
 			end
 		else
 			if cluster_group then