diff --git a/Recast/Source/Recast.cpp b/Recast/Source/Recast.cpp
index a25f579..073e595 100644
--- a/Recast/Source/Recast.cpp
+++ b/Recast/Source/Recast.cpp
@@ -264,6 +264,10 @@ rcPolyMeshDetail* rcAllocPolyMeshDetail()
 
 void rcFreePolyMeshDetail(rcPolyMeshDetail* detailMesh)
 {
+	if (detailMesh == NULL)
+	{
+		return;
+	}
 	rcFree(detailMesh->meshes);
 	rcFree(detailMesh->verts);
 	rcFree(detailMesh->tris);