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-rw-r--r--Source/Houdini/StagedHoudini.cs6
1 files changed, 6 insertions, 0 deletions
diff --git a/Source/Houdini/StagedHoudini.cs b/Source/Houdini/StagedHoudini.cs
index 40a750bb..27481e4f 100644
--- a/Source/Houdini/StagedHoudini.cs
+++ b/Source/Houdini/StagedHoudini.cs
@@ -188,6 +188,12 @@ namespace Microsoft.Boogie.Houdini
Item => plan.GetDependences(s).Contains(Item.stage)).
Select(Item => Item.parallelTask).ToArray());
+ if(s.Count() == 0) {
+ // This is the trivial first stage, so don't launch Houdini;
+ // give this a null outcome
+ return;
+ }
+
List<Houdini> h = AcquireHoudiniInstance();
if (h.Count() == 0)