Autorouter unexpectedly failing on simple design.

```
Uncaught TypeError: Cannot read property 'id' of null
    at i (editorPCB.min.js:34)
    at Object.a [as importSession] (editorPCB.min.js:34)
    at importSession (editorPCB.min.js:34)
    at n (editorPCB.min.js:2)
    at Za (main.min.js:9)
    at i.m.onResult (main.min.js:17)
    at WebSocket.o.onmessage (main.min.js:17)
```
```
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36"
```
uploaded pcb to:
```
https://oshwlab.com/qcrist/broken-autorouter
```
            
                        
            
                                    
              
                Chrome
                  89.0.4389.90
                Windows
                  10
                                EasyEDA
                  6.4.17