diff --git a/src/Workspaces/Core/Portable/Execution/PinnedRemotableDataScope.cs b/src/Workspaces/Core/Portable/Execution/PinnedRemotableDataScope.cs
index 42504565df844a243cf4ce442962058bce9a937a..995c8c30e25aaa371696440f2f58d8760c5826f0 100644
--- a/src/Workspaces/Core/Portable/Execution/PinnedRemotableDataScope.cs
+++ b/src/Workspaces/Core/Portable/Execution/PinnedRemotableDataScope.cs
@@ -25,6 +25,8 @@ internal sealed class PinnedRemotableDataScope : IDisposable
             AssetStorages.Storage storage,
             Checksum solutionChecksum)
         {
+            Contract.ThrowIfNull(solutionChecksum);
+
             _storages = storages;
             _storage = storage;