Node Red process hangs when opening Editor



After updrading Node Red to 0.19.5 opening editor app (at port 1880) makes high memory and CPU consumption and ultimately crashes the process, but with no error message. When I start it from console it just hangs and doesn't react to Ctrl+C. I roughly isolated problem - loading one of complex flows makes the process crash when opening Editor.
When I don't open Editor it works with UI Dashboard as well. Also when I start Editor with that flow disabled, and then enable and deploy the flow everything works. Only refreshing the page in the browser hangs the process.
Unfortunately I don't remember what Node Red version I've been using before update. My current configuration is:
Node-RED version: v0.19.5
Node.js version: v8.9.4
Linux 3.2.40 arm LE (Synology DSM)



if it is crashing the logs will probably suggest why. Please paste the last bit of the log file here