[Chrome DevTools] TypeError: Cannot read property 'length' of null
Reported by
rgsamw...@gmail.com,
Sep 29
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Issue descriptionUserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36 Steps to reproduce the problem: 1. Open Dev Tools 2. Select Application 3. Select WebSQL 4. Select your database 5. Run "select" query on a table containing records (some possibly having a column with a null value) What is the expected behavior? Records returned successfully. What went wrong? TypeError: Cannot read property 'length' of null The table I am running a simple select on has many columns. Running a select with some columns instead of "*" works, but not others. Also, a simple "select * from <table_name>" is returning this error. Did this work before? N/A Chrome version: 69.0.3497.100 Channel: stable OS Version: 10.0 Flash Version: Not sure when this problem began. Probaly within the last 3 months or so. Not sure why it used to work and now it produces errors.
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Sep 29
Non-null (but also non-string) value avoid the error because even if the length field does not exist for them, accessing it does not throw (null.field throws, 1..length simply returns undefined), but the automatic sizing code will probably yield the wrong width for them.
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Oct 1
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Oct 31
Hello there, has any progress been made to fix this issue?
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Nov 30
Also having this issue. Would love to see it fixed.
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Dec 5
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Dec 13
Reproduce guide: 1. goto https://webkit.org/demos/sticky-notes/ 2. open DevTools > Application > Web SQL > NoteTest 3. see image
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Dec 13
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Dec 13
The following revision refers to this bug: https://chromium.googlesource.com/chromium/src.git/+/ee6a7e474d81922cf2193ca5b5ad1cf8778d03de commit ee6a7e474d81922cf2193ca5b5ad1cf8778d03de Author: Harley Li <hhli@chromium.org> Date: Thu Dec 13 23:34:13 2018 [DevTools] WebSQL grid shows error if a field is null UI: ensure 'text' is string before accessing its field Otherwise there is an error "TypeError: Cannot read property 'length' of null" Bug: 890580 Change-Id: Iecf705fc4c8956446dd695c673e6dcf7c3a1fe41 Reviewed-on: https://chromium-review.googlesource.com/c/1377145 Commit-Queue: Haihong Li (Harley) <hhli@chromium.org> Reviewed-by: Erik Luo <luoe@chromium.org> Cr-Commit-Position: refs/heads/master@{#616486} [modify] https://crrev.com/ee6a7e474d81922cf2193ca5b5ad1cf8778d03de/third_party/blink/renderer/devtools/front_end/data_grid/DataGrid.js
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Dec 14
Able to reproduce this issue on Windows 10 on the reported version 69.0.3497.100 and the issue is fixed on the latest M-73 build 73.0.3640.0 as per comment #7. 1. Launched Chrome and navigated to https://webkit.org/demos/sticky-notes/. 2. Opened DevTools -> Application -> Web SQL -> NoteTest. 3. Entered 'INSERT INTO WebKitStickyNotes VALUES (2.null,0,0,0,0);' and SELECT * FROM WebKitStickyNotes; and could observe that the records are returned successfully. Attached is the screen shot for reference. Hence adding TE verified labels as the fix is working as intended. Thanks..
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Dec 14
Thanks all!! This bug actually forced us to re-write some code, but I think it will be worth it. I'll keep an eye out for the fix in the legacy project. Cheers. |
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Comment 1 by phistuck@chromium.org
, Sep 2921.4 KB
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