diff --git a/src/VisualStudio/Core/SolutionExplorerShim/HierarchyItemToProjectIdMap.cs b/src/VisualStudio/Core/SolutionExplorerShim/HierarchyItemToProjectIdMap.cs
index 46c6e7688b7d1..4932a8941a31c 100644
--- a/src/VisualStudio/Core/SolutionExplorerShim/HierarchyItemToProjectIdMap.cs
+++ b/src/VisualStudio/Core/SolutionExplorerShim/HierarchyItemToProjectIdMap.cs
@@ -6,7 +6,6 @@
 using Microsoft.CodeAnalysis.Host.Mef;
 using Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem;
 using Microsoft.VisualStudio.Shell;
-using Microsoft.VisualStudio.Shell.Interop;
 
 namespace Microsoft.VisualStudio.LanguageServices.Implementation.SolutionExplorer
 {
@@ -47,6 +46,16 @@ public bool TryGetProjectId(IVsHierarchyItem hierarchyItem, string targetFramewo
             var project = _workspace.DeferredState.ProjectTracker.ImmutableProjects
                     .Where(p =>
                     {
+                        // We're about to access various properties of the IVsHierarchy associated with the project.
+                        // The properties supported and the interpretation of their values varies from one project system
+                        // to another. This code is designed with C# and VB in mind, so we need to filter out everything
+                        // else.
+                        if (p.Language != LanguageNames.CSharp
+                            && p.Language != LanguageNames.VisualBasic)
+                        {
+                            return false;
+                        }
+
                         // Here we try to match the hierarchy from Solution Explorer to a hierarchy from the Roslyn project.
                         // The canonical name of a hierarchy item must be unique _within_ an hierarchy, but since we're
                         // examining multiple hierarchies the canonical name could be the same. Indeed this happens when two