pm2 monit crashes

[cameralis]

What's going wrong?

I run pm2 monit while a process is running. When specific text is outputted into the log, monit crashes.

How could we reproduce this issue?

I honestly have no idea

Supporting information

TypeError: Cannot read properties of null (reading 'slice')
    at /usr/lib/node_modules/pm2/node_modules/blessed/lib/program.js:2543:35
    at Array.forEach (<anonymous>)
    at Program._attr (/usr/lib/node_modules/pm2/node_modules/blessed/lib/program.js:2542:11)
    at Box.Element._parseTags (/usr/lib/node_modules/pm2/node_modules/blessed/lib/widgets/element.js:498:26)
    at Box.Element.parseContent (/usr/lib/node_modules/pm2/node_modules/blessed/lib/widgets/element.js:393:22)
    at Box.<anonymous> (/usr/lib/node_modules/pm2/node_modules/blessed/lib/widgets/element.js:184:10)
    at Box.EventEmitter._emit (/usr/lib/node_modules/pm2/node_modules/blessed/lib/events.js:94:20)
    at Box.EventEmitter.emit (/usr/lib/node_modules/pm2/node_modules/blessed/lib/events.js:117:12)
    at emit (/usr/lib/node_modules/pm2/node_modules/blessed/lib/widgets/node.js:109:15)
    at List.Node.insert (/usr/lib/node_modules/pm2/node_modules/blessed/lib/widgets/node.js:111:5)

pm2 v5.2.2
node v16.19.1

[cameralis]

Could this be an issue with blessed?

[jamie0xgitc0decat]

Same here
TypeError: Cannot read properties of null (reading 'slice')
at /root/.nvm/versions/node/v18.17.0/lib/node_modules/pm2/node_modules/blessed/lib/program.js:2543:35
at Array.forEach ()
at Program._attr (/root/.nvm/versions/node/v18.17.0/lib/node_modules/pm2/node_modules/blessed/lib/program.js:2542:11)
at Element._parseTags (/root/.nvm/versions/node/v18.17.0/lib/node_modules/pm2/node_modules/blessed/lib/widgets/element.js:498:26)
at Element.parseContent (/root/.nvm/versions/node/v18.17.0/lib/node_modules/pm2/node_modules/blessed/lib/widgets/element.js:393:22)
at Box. (/root/.nvm/versions/node/v18.17.0/lib/node_modules/pm2/node_modules/blessed/lib/widgets/element.js:184:10)
at EventEmitter._emit (/root/.nvm/versions/node/v18.17.0/lib/node_modules/pm2/node_modules/blessed/lib/events.js:94:20)
at EventEmitter.emit (/root/.nvm/versions/node/v18.17.0/lib/node_modules/pm2/node_modules/blessed/lib/events.js:117:12)
at emit (/root/.nvm/versions/node/v18.17.0/lib/node_modules/pm2/node_modules/blessed/lib/widgets/node.js:109:15)
at Node.insert (/root/.nvm/versions/node/v18.17.0/lib/node_modules/pm2/node_modules/blessed/lib/widgets/node.js:111:5)

pm2 version: 5.3.0

[adrianhelvikspond]

Same here.

❯ pm2 monit

TypeError: Cannot read properties of null (reading 'slice')
    at /Users/adrian.helvik/.volta/tools/image/packages/pm2/lib/node_modules/blessed/lib/program.js:2543:35
    at Array.forEach (<anonymous>)
    at Program._attr (/Users/adrian.helvik/.volta/tools/image/packages/pm2/lib/node_modules/blessed/lib/program.js:2542:11)
    at Element._parseTags (/Users/adrian.helvik/.volta/tools/image/packages/pm2/lib/node_modules/blessed/lib/widgets/element.js:479:26)
    at Element.parseContent (/Users/adrian.helvik/.volta/tools/image/packages/pm2/lib/node_modules/blessed/lib/widgets/element.js:393:22)
    at Box.<anonymous> (/Users/adrian.helvik/.volta/tools/image/packages/pm2/lib/node_modules/blessed/lib/widgets/element.js:184:10)
    at EventEmitter._emit (/Users/adrian.helvik/.volta/tools/image/packages/pm2/lib/node_modules/blessed/lib/events.js:94:20)
    at EventEmitter.emit (/Users/adrian.helvik/.volta/tools/image/packages/pm2/lib/node_modules/blessed/lib/events.js:117:12)
    at emit (/Users/adrian.helvik/.volta/tools/image/packages/pm2/lib/node_modules/blessed/lib/widgets/node.js:109:15)
    at Node.insert (/Users/adrian.helvik/.volta/tools/image/packages/pm2/lib/node_modules/blessed/lib/widgets/node.js:111:5)

[adrianhelvikspond]

[adrianhelvikspond]

Probably an issue with blessed though. I'll see if I can determine what is causing this.

[adrianhelvik]

I submitted a PR to blessed to resolve this issue.

chjj/blessed#439

[deksden]

pm2 6.0.8 - same bug

[Unitech]

I forked blessed and merged your PR

Could you try it and confirm it has fixed your issue:

npm install Unitech/pm2#development -g
pm2 update

[deksden]

I forked blessed and merged your PR

Could you try it and confirm it has fixed your issue:

npm install Unitech/pm2#development -g
pm2 update

Tried 2 times to reproduce bug with new version - all is ok! Before every 'pm2 restart all' crashes 'pm2 monit'.

So, iI'll keep monitoring and return when i'll have more info

[Unitech]

Great to hear ! I will publish this new version soon

[Unitech]

Fixed on PM2 6.0.12:

npm install pm2@6.0.12 -g
pm2 update