diff --git a/model_format_glb.c b/model_format_glb.c
index fed6cb6..62a5bc7 100644
--- a/model_format_glb.c
+++ b/model_format_glb.c
@@ -460,8 +460,10 @@ static void read_joint_children(
 			if (skin.joints[j] == i)
 				break;
 		}
+
 		assert(j < skin.joint_count);
 		assert(bones[j].parent == UINT32_MAX);
+		assert(parent < j);
 		bones[j].parent = parent;
 
 		if (**p == ',')