diff --git a/CycloneDX/Services/ProjectFileService.cs b/CycloneDX/Services/ProjectFileService.cs
index d0b829bb..1cb7afba 100755
--- a/CycloneDX/Services/ProjectFileService.cs
+++ b/CycloneDX/Services/ProjectFileService.cs
@@ -344,6 +344,12 @@ public async Task<HashSet<DotnetDependency>> RecursivelyGetProjectReferencesAsyn
             while (files.Count > 0)
             {
                 var currentFile = files.Dequeue();
+
+                if (!Utils.IsSupportedProjectType(currentFile))
+                {
+                    continue;
+                }
+
                 // Find all project references inside of currentFile
                 var foundProjectReferences = await GetProjectReferencesAsync(currentFile).ConfigureAwait(false);