Rewards popup doesn't show on Nightly

Panel should be shown
Easy on my machine
Brave | 0.69.77 Chromium: 76.0.3809.62聽(Official Build)聽nightly聽(64-bit)
-- | --
Revision | 7b77856b3aa34d72f246d12340fc1ded8b2c0e83-refs/branch-heads/3809@{#798}
OS | Linux
Close and restart browser doesn't fix the issue
This is intermittently reproducible when you have a notification on the BAT logo.
Steps I used to reproduce:

I have seen this issue once in Beta channel 0.68.114. Steps which I have followed to reproduce the issue:

@NejcZdovc we've got a report of this in from community as well: https://community.brave.com/t/unable-to-open-brave-rewards-with-triangle-icon-in-internet-search-box/75914
This has now hit beta channel and will likely be affecting more users.
cc @rebron @alexwykoff
+1 from community: https://community.brave.com/t/problem-mounting-rewards-panel/76917
Verification passed on
Brave | 0.69.115 Chromium: 76.0.3809.100聽(Official Build)聽beta聽(64-bit)
-- | --
Revision | ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS | Windows聽10 OS Version 1803 (Build 17134.523)
Verification passed on
Brave | 0.69.116 Chromium: 76.0.3809.100聽(Official Build)聽beta聽(64-bit)
-- | --
Revision | ed9d447d30203dc5069e540f05079e493fc1c132-refs/branch-heads/3809@{#990}
OS | Ubuntu 18.04 LTS
Verified passed with
Brave | 0.69.124 Chromium: 76.0.3809.132聽(Official Build)聽(64-bit)
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Revision | fd1acc410994a7a68ac25bc77513d443f3130860-refs/branch-heads/3809@{#1035}
OS | Mac OS X
reproduced the issue on 0.68.132 with the profile from test plan

upgraded to 0.69.124 and verified the issue no longer occurred. Was also able to dismiss the notifications that had been generated while the panel was a small white box.

Verified the test plan from https://github.com/brave/brave-core/pull/3201
I'm getting this issue on version 0.68.132 / Windows 10
@devcshort Can you inspect that window, and see what the console says? I suspect there's a problem calling .toString off an object somewhere. Would love your assistance in confirming.
@jonathansampson

@devcshort Thank you. I suspect you're seeing the same issue as another user. I just did a quick debugging session with them, and we found that l.total was undefined in the render method. I've shared this with the team, and we'll be working on a fix for 0.69.x.

See https://github.com/brave/brave-browser/issues/5987#issuecomment-530364300 for ways to trigger white box from panel on 0.68.134.
I am able to reproduce the scenarios mentioned in the comments https://github.com/brave/brave-browser/issues/5987#issuecomment-530364300 and https://github.com/brave/brave-browser/issues/5987#issuecomment-530437455 in brave version 0.68.135
Reproduced on
Brave | 0.68.135 Chromium: 77.0.3865.75聽(Official Build)聽(64-bit)
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Revision | 201e747d032611c5f2785cae06e894cf85be7f8a-refs/branch-heads/3865@{#776}
OS | Ubuntu 18.04 LTS

Verification passed on
Brave | 0.68.138 Chromium: 77.0.3865.75聽(Official Build)聽(64-bit)
-- | --
Revision | 201e747d032611c5f2785cae06e894cf85be7f8a-refs/branch-heads/3865@{#776}
OS | Windows聽10 OS Version 1803 (Build 17134.1006)
Verification passed on
Brave | 0.68.138 Chromium: 77.0.3865.75聽(Official Build)聽(64-bit)
-- | --
Revision | 201e747d032611c5f2785cae06e894cf85be7f8a-refs/branch-heads/3865@{#776}
OS | Ubuntu 18.04 LTS
Verification PASSED on macOS 10.14.6 x64 using the following build:
Brave | 0.68.138 Chromium: 77.0.3865.75聽(Official Build)聽(64-bit)
-- | --
Revision | 201e747d032611c5f2785cae06e894cf85be7f8a-refs/branch-heads/3865@{#776}
OS | macOS Version 10.14.6 (Build 18G95)