UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.18 Safari/537.36

Steps to reproduce the problem:
1. Use Chrome < 54.0.2833.0.
2. Change default columns in Network.
2. Upgrade to Chrome > 54.0.2833.0 on the same profile.

What is the expected behavior?
Custom headers can be added (or managed).

What went wrong?
Clicking the menu item causes an error.

"TypeError: Cannot read property 'toLowerCase' of undefined TypeError: Cannot read property 'toLowerCase' of undefined
    at columnData.forEach.columnData (chrome-devtools://devtools/bundled/network/network_module.js:568:5848)
    at Array.forEach (native)
    at Network.NetworkManageCustomHeadersView (chrome-devtools://devtools/bundled/network/network_module.js:568:5788)
    at Network.NetworkLogViewColumns._manageCustomHeaderDialog (chrome-devtools://devtools/bundled/network/network_module.js:547:25)
    at UI.ContextMenu._itemSelected (chrome-devtools://devtools/bundled/inspector.js:1642:20)
    at UI.ContextMenu._onItemSelected (chrome-devtools://devtools/bundled/inspector.js:1640:29)
    at Common.Object.dispatchEventToListeners (chrome-devtools://devtools/bundled/inspector.js:393:179)
    at innerDispatch (chrome-devtools://devtools/bundled/inspector.js:973:98)
    at InspectorFrontendAPIImpl._dispatch (chrome-devtools://devtools/bundled/inspector.js:973:1)
    at DevToolsAPIImpl._dispatchOnInspectorFrontendAPI (chrome-devtools://devtools/bundled/devtools_compatibility.js:57:36)", source: chrome-devtools://devtools/bundled/inspector.js (973)

Also notice that a bogus header has been added.

Did this work before? No 

Chrome version: 56.0.2924.18  Channel: dev
OS Version: 14.04
Flash Version:
 

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