From 2e30c7f6cb6efe87be6ed2bde25627103329314c Mon Sep 17 00:00:00 2001
From: krangelov <kr.angelov@gmail.com>
Date: Fri, 17 Sep 2021 12:01:14 +0200
Subject: [PATCH] bugfix

---
 src/runtime/c/pgf/namespace.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/runtime/c/pgf/namespace.h b/src/runtime/c/pgf/namespace.h
index af1dc1f1c..fa92dd830 100644
--- a/src/runtime/c/pgf/namespace.h
+++ b/src/runtime/c/pgf/namespace.h
@@ -359,8 +359,10 @@ Namespace<V> namespace_insert(Namespace<V> map, ref<V> value)
         namespace_release(right);
         return node;
     } else {
-        map->left->ref_count++;
-        map->right->ref_count++;
+        if (map->left != 0)
+            map->left->ref_count++;
+        if (map->right != 0)
+            map->right->ref_count++;
         return Node<V>::new_node(value,map->left,map->right);
     }
 }