Check hasOwnProperty before accessing field #2647
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I was encountering the same issue and this fixes it. |
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I've been getting
Cannot read property 'breakpoint' of undefinedhere from our Javascript error tracking system. I have not been able to reproduce this outside of a testcase, and I am unsure what exactly is causing this error (perhaps some third party abusing the Array prototype), but this should solve it.Testcase here.