diff --git a/src/editor/value_explorer.js b/src/editor/value_explorer.js
index 6699e68..aca804f 100644
--- a/src/editor/value_explorer.js
+++ b/src/editor/value_explorer.js
@@ -6,7 +6,7 @@
 
 import {el, stringify, scrollIntoViewIfNeeded} from './domutils.js'
 import {with_code_execution} from '../index.js'
-import {header, is_expandable} from '../value_explorer_utils.js'
+import {header, is_expandable, displayed_entries} from '../value_explorer_utils.js'
 
 
 const get_path = (o, path) => {
@@ -236,7 +236,13 @@ export class ValueExplorer {
     this.set_active(this.current_path, true)
   }
 
-  render_value_explorer_node(key, value, path, node_data) {
+  render_value_explorer_node(...args) {
+    return with_code_execution(() => {
+      return this.do_render_value_explorer_node(...args)
+    })
+  }
+
+  do_render_value_explorer_node(key, value, path, node_data) {
 
     const is_exp = is_expandable(value)
     const is_expanded = is_exp && node_data.is_expanded
diff --git a/src/index.js b/src/index.js
index a0a6242..0315bd2 100644
--- a/src/index.js
+++ b/src/index.js
@@ -291,6 +291,8 @@ export const exec = (cmd, ...args) => {
   }
 
 
+  // Wrap with_code_execution, because rendering values can trigger execution
+  // of code by toString() and toJSON() methods
   with_code_execution(() => {
     apply_side_effects(state, nextstate, cmd, ui);
 
diff --git a/src/value_explorer_utils.js b/src/value_explorer_utils.js
index a5085cf..aa27615 100644
--- a/src/value_explorer_utils.js
+++ b/src/value_explorer_utils.js
@@ -22,15 +22,13 @@ const isDate = object =>
 
 const toJSON_safe = object => {
   try {
-    return with_code_execution(() => {
-      return object.toJSON() 
-    })
+    return object.toJSON() 
   } catch(e) {
     return object
   }
 }
 
-const displayed_entries = object => {
+export const displayed_entries = object => {
   if(object == null || typeof(object) != 'object') {
     return []
   } else if((object[Symbol.toStringTag]) == 'Module') {