Repeated error when previewing

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  • I'm not sure if this is a bug with Construct 3 itself, or something else has gone wrong, so I hope this is the best place to post this!

    I am getting an error repeatedly whenever I try to preview the game.

    When previewing, the preview opens up (I've tried this as both browser and popup window and the same thing happens), but the project file crashes with the "oops something went wrong" message and I have to restart the session.

    This happens whether Construct 3 is in browser or offline app, and it happens with a clean project file (no assets etc) too.

    This is a copy of the error report - any ideas at what could be causing this?

    Error report information

    Type: unhandled exception

    File:, line 1, col 573

    Message: Uncaught DataCloneError: Failed to execute 'postMessage' on 'Window': HTMLDocument object could not be cloned.

    Stack: Error: Failed to execute 'postMessage' on 'Window': HTMLDocument object could not be cloned. at XMLHttpRequest.onreadystatechange (:1:573)

    Construct 3 version: r197.2


    Date: Wed Apr 29 2020 17:00:34 GMT+0100 (British Summer Time)

    Uptime: 7.6 s

    Platform information

    Browser: Chrome

    Browser version: 81.0.4044.129

    Browser engine: Chromium

    Browser architecture: 64-bit

    Context: webapp

    Operating system: Windows

    Operating system version: 7

    Operating system architecture: 64-bit

    Device type: desktop

    Device pixel ratio: 1

    Logical CPU cores: 8

    Approx. device memory: 8 GB

    User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36

    C3 release: r197.2 (stable)

    Language setting: en-US

    WebGL information

    Version string: WebGL 2.0 (OpenGL ES 3.0 Chromium)

    Numeric version: 2

    Supports NPOT textures: yes

    Supports GPU profiling: yes

    Supports highp precision: yes

    Vendor: Google Inc.

    Renderer: ANGLE (NVIDIA GeForce GTX 760 Direct3D11 vs_5_0 ps_5_0)

    Major performance caveat: no

    Maximum texture size: 16384

    Point size range: 1 to 1024

    Extensions: EXT_color_buffer_float, EXT_disjoint_timer_query_webgl2, EXT_float_blend, EXT_texture_filter_anisotropic, KHR_parallel_shader_compile, OES_texture_float_linear, WEBGL_compressed_texture_s3tc, WEBGL_compressed_texture_s3tc_srgb, WEBGL_debug_renderer_info, WEBGL_debug_shaders, WEBGL_lose_context, OVR_multiview2

  • It's hard to say anything, it might be a bug. I'd suggest filing an issue following all the guidelines. We need all that information to figure out what's going on anyway.

    Do you have any browser extensions? Does disabling them help? Previews work fine for me here and the error is quite mysterious - sometimes browser extensions interfere with the page and break stuff.

  • Thank you Ashley for your quick reply!

    I was just checking out my chrome extensions and have removed some/switched some off and the preview is now working fine it seems and appears the issue is fixed!

    If anything returns I'll make sure and file a report properly

  • Can you identify which browser extension is the one that causes the problem? It would be useful to know in case anyone else runs in to the same problem. I could also look in to a way of notifying the developer, or working around the problem.

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  • I turned off a bunch at once, but I can take a look and see if I can recreate it!

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