1 files changed, 3 insertions, 1 deletions

diff --git a/swig/plist.i b/swig/plist.i
index 055039b..2347a6d 100644
--- a/swig/plist.i
+++ b/swig/plist.i
@@ -67,7 +67,9 @@ typedef struct {
         }
 
         void add_sub_node(PListNode* subnode) {
-                plist_add_sub_node($self->node, subnode);
+                if (subnode) {
+                        plist_add_sub_node($self->node, subnode->node);
+                }
         }
 
         void add_sub_key(char* k) {