Email In Node Crashed Node-RED

10 Dec 09:50:09 - [info] [e-mail in:a] Checking IMAP for new messages                                                               
10 Dec 09:50:09 - [red] Uncaught Exception:                                                                                         
10 Dec 09:50:09 - TypeError: Cannot read property 'type' of undefined                                                               
    at Connection._resUntagged (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Connection.js:
1260:51)                                                                                                                            
    at Parser.<anonymous> (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Connection.js:190:1
0)                                                                                                                                  
    at emitOne (events.js:96:13)                                                                                                    
    at Parser.emit (events.js:188:7)                                                                                                
    at Parser._resUntagged (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Parser.js:271:10) 
    at Parser._parse (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Parser.js:137:16)       
    at Parser._tryread (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Parser.js:82:15)      
    at TLSSocket.Parser._cbReadable (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Parser.js
:53:12)                                                                                                                             
    at emitNone (events.js:86:13)                                                                                                   
    at TLSSocket.emit (events.js:185:7)                                                                                             
    at emitReadable_ (_stream_readable.js:432:10)                                                                                   
    at emitReadable (_stream_readable.js:426:7)                                                                                     
    at readableAddChunk (_stream_readable.js:187:13)                                                                                
    at TLSSocket.Readable.push (_stream_readable.js:134:10)                                                                         
    at TLSWrap.onread (net.js:548:20)                                                                                               
    at Socket.ondata (_stream_wrap.js:58:20)                                                                                        
    at emitOne (events.js:96:13)                                                                                                    
    at Socket.emit (events.js:188:7)                                                                                                
    at readableAddChunk (_stream_readable.js:176:18)                                                                                
    at Socket.Readable.push (_stream_readable.js:134:10)                                                                            
    at TCP.onread (net.js:548:20)       

Running on Windows 10 (Windows_NT 10.0.14393 x64 LE), Node.js v6.9.1, latest Node-RED v0.15.2

Restarting causes another error:

10 Dec 14:03:02 - [info] [e-mail in:a] Checking IMAP for new messages                                                               
10 Dec 14:03:03 - [red] Uncaught Exception:                                                                                         
10 Dec 14:03:03 - TypeError: Cannot set property 'name' of undefined                                                                
    at Connection.<anonymous> (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Connection.js:4
26:22)                                                                                                                              
    at Connection._resTagged (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Connection.js:15
30:22)                                                                                                                              
    at Parser.<anonymous> (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Connection.js:193:1
0)                                                                                                                                  
    at emitOne (events.js:96:13)                                                                                                    
    at Parser.emit (events.js:188:7)                                                                                                
    at Parser._resTagged (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Parser.js:175:10)   
    at Parser._parse (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Parser.js:139:16)       
    at Parser._tryread (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Parser.js:82:15)      
    at TLSSocket.Parser._cbReadable (C:\Users\julia\AppData\Roaming\nvm\v6.9.1\node_modules\node-red\node_modules\imap\lib\Parser.js
:53:12)                                                                                                                             
    at emitNone (events.js:86:13)                                                                                                   
    at TLSSocket.emit (events.js:185:7)                                                                                             
    at emitReadable_ (_stream_readable.js:432:10)                                                                                   
    at emitReadable (_stream_readable.js:426:7)                                                                                     
    at readableAddChunk (_stream_readable.js:187:13)                                                                                
    at TLSSocket.Readable.push (_stream_readable.js:134:10)                                                                         
    at TLSWrap.onread (net.js:548:20)                                                                                               
    at Socket.ondata (_stream_wrap.js:58:20)                                                                                        
    at emitOne (events.js:96:13)                                                                                                    
    at Socket.emit (events.js:188:7)                                                                                                

Node-RED is now unstartable. I'll have to revert to the backup flow file.

Start with the e-mail in node and reproduce the IMAP failure using the reported Windows and Node.js versions. Trace the errors through node_modules/imap/lib/Connection.js and Parser.js, especially the reported _resUntagged and _resTagged locations. Done means the e-mail check no longer crashes Node-RED or leaves it unable to start.