`panic: keyword "PROXY-ERROR %s\n" contains forbidden bytes` when using snowflake

TBB log:

10/14/19, 10:22:02.757 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections. 
10/14/19, 10:22:10.815 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections. 
10/14/19, 10:22:10.816 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections. 
10/14/19, 10:22:10.816 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections. 
10/14/19, 10:22:10.816 [NOTICE] Opening Socks listener on 127.0.0.1:9150 
10/14/19, 10:22:10.816 [NOTICE] Opened Socks listener on 127.0.0.1:9150 
10/14/19, 10:22:10.948 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: panic: keyword "PROXY-ERROR %s\n" contains forbidden bytes 
10/14/19, 10:22:10.949 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported:  
10/14/19, 10:22:10.949 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: goroutine 1 [running]: 
10/14/19, 10:22:10.949 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: git.torproject.org/pluggable-transports/goptlib%2egit.formatline(0x83e73d3, 0xf, 0xa0d7f4c, 0x1, 0x1, 0x1, 0x1) 
10/14/19, 10:22:10.949 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: 	/var/tmp/dist/gopath/src/git.torproject.org/pluggable-transports/goptlib.git/pt.go:250 +0x267 
10/14/19, 10:22:10.950 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: git.torproject.org/pluggable-transports/goptlib%2egit.line(0x83e73d3, 0xf, 0xa0d7f4c, 0x1, 0x1) 
10/14/19, 10:22:10.950 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: 	/var/tmp/dist/gopath/src/git.torproject.org/pluggable-transports/goptlib.git/pt.go:266 +0x45 
10/14/19, 10:22:10.950 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: git.torproject.org/pluggable-transports/goptlib%2egit.doError(...) 
10/14/19, 10:22:10.950 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: 	/var/tmp/dist/gopath/src/git.torproject.org/pluggable-transports/goptlib.git/pt.go:271 
10/14/19, 10:22:10.950 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: git.torproject.org/pluggable-transports/goptlib%2egit.ProxyError(...) 
10/14/19, 10:22:10.950 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: 	/var/tmp/dist/gopath/src/git.torproject.org/pluggable-transports/goptlib.git/pt.go:302 
10/14/19, 10:22:10.950 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: main.main() 
10/14/19, 10:22:10.950 [WARN] Managed proxy at './TorBrowser/Tor/PluggableTransports/snowflake-client' reported: 	/var/tmp/build/snowflake-49a899be452a/client/snowflake.go:158 +0xd81 
10/14/19, 10:22:10.951 [WARN] Pluggable Transport process terminated with status code 512

TBB version:tor-browser-linux32-9.0a7_en-US.tar.xz

Trac:
Username: omlnnuci