UserAgent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0

Steps to reproduce the problem:
#1 open a chrome process with remote debugger port
google-chrome-stable --remote-debugging-port=9222 https://www.google.com

#2 open *another* chrome process, 
google-chrome-unstable 

#3 In google-chrome-unstable process, visit chrome://inspect/#devices, find a remote target from google-chrome-stable, click the "reload" link.

The google-chrome-unstable will send 

{'method': 'Page.reload', id: 1}

to google-chrome-stable, the data is not a valid JSON.

And the page doesn't reload.

I attach the wireshark screenshots.

What is the expected behavior?
the data should be 

{"method": "Page.reload", "id": 1}

What went wrong?
Command data is not a valid JSON

Did this work before? N/A 

Chrome version: 73.0.3639.1  Channel: n/a
OS Version: Fedora 28
Flash Version:
 

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