diff --git a/src/toniarts/openkeeper/tools/convert/KmfModelLoader.java b/src/toniarts/openkeeper/tools/convert/KmfModelLoader.java
index a8468350..7df9c648 100644
--- a/src/toniarts/openkeeper/tools/convert/KmfModelLoader.java
+++ b/src/toniarts/openkeeper/tools/convert/KmfModelLoader.java
@@ -561,6 +561,10 @@ private Geometry createGeometry(int index, String name, Mesh mesh, Map<Integer,
         // 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);