diff --git a/src/toniarts/openkeeper/tools/convert/KmfModelLoader.java b/src/toniarts/openkeeper/tools/convert/KmfModelLoader.java
index 3e2f541b..d5ccd456 100644
--- a/src/toniarts/openkeeper/tools/convert/KmfModelLoader.java
+++ b/src/toniarts/openkeeper/tools/convert/KmfModelLoader.java
@@ -568,6 +568,10 @@ private Geometry createGeometry(int subMeshIndex, String meshName, Mesh mesh, Ma
         // Update bounds
         geom.updateModelBound();
 
+        // prevent the warnings caused by the tangent generation on "empty" main index buffers
+        if (mesh.getTriangleCount() == 0)
+            return geom;
+
         // Try to generate tangents
         try {
             MikktspaceTangentGenerator.generate(geom);