diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index cd1a6e61151..47fc72f5e52 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -1524,9 +1524,11 @@ void NodeTagChanged(bNodeTree *ntree, bNode *node)
 {
 	bNodeTreeType *ntreetype = ntreeGetType(ntree->type);
 	
-	if (ntreetype->update_node)
+	/* extra null pointer checks here because this is called when unlinking
+	   unknown nodes on file load, so typeinfo pointers may not be set */
+	if (ntreetype && ntreetype->update_node)
 		ntreetype->update_node(ntree, node);
-	else if (node->typeinfo->updatefunc)
+	else if (node->typeinfo && node->typeinfo->updatefunc)
 		node->typeinfo->updatefunc(ntree, node);
 }
 
diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index d1a19f24b97..664148157cb 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -2217,8 +2217,9 @@ static void direct_link_nodetree(FileData *fd, bNodeTree *ntree)
 		if(node->type == NODE_DYNAMIC) {
 			node->custom1= 0;
 			node->custom1= BSET(node->custom1, NODE_DYNAMIC_LOADED);
-			node->typeinfo= NULL;
 		}
+
+		node->typeinfo= NULL;
 		
 		link_list(fd, &node->inputs);
 		link_list(fd, &node->outputs);