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try this and rebuild the game, this will ignore error and let u continue the game in browser

  1. Open your project in the Unity Editor.
  2. From the Unity Editor menu, select Edit > Project Settings.
  3. Under Publishing Settings, set Enable Exceptions to Full Without Stacktrace.

reference:
https://www.reddit.com/r/Unity3D/comments/zscwai/3d_unity_webgl_error_runtimeerr...

it worked! thank you so much