showbc: Dump LOAD_NULL.
diff --git a/py/showbc.c b/py/showbc.c
index c1e420f..8d6e867 100644
--- a/py/showbc.c
+++ b/py/showbc.c
@@ -106,6 +106,10 @@
                 printf("LOAD_CONST_STRING %s", qstr_str(qstr));
                 break;
 
+            case MP_BC_LOAD_NULL:
+                printf("LOAD_NULL");
+                break;
+
             case MP_BC_LOAD_FAST_0:
                 printf("LOAD_FAST_0");
                 break;