I can replicate in 59.0.3046.0 (Official Build) canary (64-bit) but not 57.0.2987.110 (Official Build) (64-bit).

Possibly introduced in https://codereview.chromium.org/2714913002?

It looks like the issue is that 'Request Cookies' and 'Response Cookies' are treated separately in the Cookies pane in the network panel, and it's not uncommon to see no cookies set in one of these categories. Passing a null cookies parameter to _findSelectedCookie causes a JS error.

I have submitted a CL to codereview: https://codereview.chromium.org/2760013002

The offending patch was landed in M58.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b8fba9d8708e06e1543bc3d9fe589640c8853137

commit b8fba9d8708e06e1543bc3d9fe589640c8853137
Author: james <james@apphaus.co.uk>
Date: Wed Mar 22 19:45:25 2017

DevTools: Fixes regression in cookies tab in Network panel having no output

Clicking on a request in the Network panel and selecting the cookies tab resulted in no output in this tab, despite there being cookies set.

This appears to be a regression in https://codereview.chromium.org/2714913002

BUG= 702940 

Review-Url: https://codereview.chromium.org/2760013002
Cr-Commit-Position: refs/heads/master@{#458847}

[modify] https://crrev.com/b8fba9d8708e06e1543bc3d9fe589640c8853137/third_party/WebKit/Source/devtools/front_end/cookie_table/CookiesTable.js

Confirmed fix is working as expected in Canary 59.0.3049.

Your change meets the bar and is auto-approved for M58. Please go ahead and merge the CL to branch 3029 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), bhthompson@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4ef1eee5f993e196c8ad92346ea9ba7e1854e722

commit 4ef1eee5f993e196c8ad92346ea9ba7e1854e722
Author: phulce <phulce@chromium.org>
Date: Fri Mar 24 00:34:29 2017

DevTools: Fixes regression in cookies tab in Network panel having no output

Clicking on a request in the Network panel and selecting the cookies tab resulted in no output in this tab, despite there being cookies set.

This appears to be a regression in https://codereview.chromium.org/2714913002

BUG= 702940 
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2760013002
Cr-Commit-Position: refs/heads/master@{#458847}
(cherry picked from commit b8fba9d8708e06e1543bc3d9fe589640c8853137)

Review-Url: https://codereview.chromium.org/2768383003
Cr-Commit-Position: refs/branch-heads/3029@{#400}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}

[modify] https://crrev.com/4ef1eee5f993e196c8ad92346ea9ba7e1854e722/third_party/WebKit/Source/devtools/front_end/cookie_table/CookiesTable.js

Tested the issue on Mac OS 10.12.3 using chrome latest Beta M58-58.0.3029.41 by following steps mentioned in the original comment. Observed that cookies tab is generating as expected. Hence adding TE-Verified label.

Please find the screen shot for reference.

Thank you!

Deleted: 702940.png 284 KB

	702940.png 284 KB View Download