diff --git a/source/blender/blenkernel/intern/node.cc b/source/blender/blenkernel/intern/node.cc
index 5a4849f1d05..c5fb9030847 100644
--- a/source/blender/blenkernel/intern/node.cc
+++ b/source/blender/blenkernel/intern/node.cc
@@ -1380,6 +1380,7 @@ static void node_free_type(void *nodetype_v)
   }
 
   delete nodetype->fixed_declaration;
+  nodetype->fixed_declaration = nullptr;
 
   /* Can be null when the type is not dynamically allocated. */
   if (nodetype->free_self) {