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Editorial Team
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Asked: 2026-05-23T04:14:46+00:00

ActionView::Template::Error (HandleScope::HandleScope: Entering the V8 API without proper locking in place (in /app/app/assets/javascripts/application.js)): 3:

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ActionView::Template::Error (HandleScope::HandleScope: Entering the V8 API without proper locking in place
  (in /app/app/assets/javascripts/application.js)):
    3: <head>
    4: <title>Reminders</title>
    5: <%= stylesheet_link_tag    "application" %>
    6: <%= javascript_include_tag "application" %>
    7: <%= csrf_meta_tags %>
    8: <link rel="stylesheet" type="text/css" href="/assets/stylesheets/bg_<%= current_or_guest_user.background %>.css" />
    9: </head>  
app/views/layouts/application.html.erb:6:in `_app_views_layouts_application_html_erb___1680303581718722157_49016340'

Any idea what’s causing this? I’m new to ruby, rails, and heroku, so there’s a lot of things I might be doing wrong.

If I get rid of the javascript_include_tag my app runs, but then of course I get no javascript.

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1 Answer

  1. Editorial Team

    ExecJS 1.1.3 implements locking for V8. This should solve your issues with JS minified.

    https://github.com/sstephenson/execjs/commit/a48bc7c7ad03bec4f8abde1fa76c95cccc59f818#comments

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