Uncaught TypeError using collab demo

1

Basically I open two collab demo on two chrome windows and quickly switch between them doing writing/deleting and lot’s of undo redo After a while (I tried quite a bit but could not find a simple way to reproduce) I get a debugger break in one of them, and in the console:

bundle_collab.js:1854 Uncaught TypeError: Cannot read property ‘selection’ of undefined at Branch.popEvent (bundle_collab.js:1854) at histTransaction (bundle_collab.js:2117) at redo (bundle_collab.js:2204) at Plugin.handleKeyDown (bundle_collab.js:2538) at bundle_collab.js:11836 at EditorView.someProp (bundle_collab.js:11489) at editHandlers.keydown (bundle_collab.js:11836) at HTMLDivElement. (bundle_collab.js:11782)

2

I spent a while trying to reproduce this, but didn’t manage to. If you can provide a more detailed description of the editing behavior that causes it, or even better, a list of steps (which the collab demo records, so if you’re running it locally you could get them after the crash), that’d be useful.

3

ok I reproduced it and have the debugger stopped on bundle_collab.js:1854

the value of end is 0 here, this causes this$1.items.get(end - 1) to return ‘undefined’ so that next is undefined and next.selection is invalid.

JSON.stringify(state.collab$.unconfirmed) returns:

"{"values":[{"step":{"stepType":"replace","from":138,"to":139},"inverted":{"stepType":"replace","from":138,"to":138,"slice":{"content":[{"type":"text","text":" "}],"openLeft":0,"openRight":0}}},{"step":{"stepType":"replace","from":137,"to":138},"inverted":{"stepType":"replace","from":137,"to":137,"slice":{"content":[{"type":"text","text":"f"}],"openLeft":0,"openRight":0}}},{"step":{"stepType":"replace","from":134,"to":137},"inverted":{"stepType":"replace","from":134,"to":134,"slice":{"content":[{"type":"text","text":"d s"}],"openLeft":0,"openRight":0}}},{"step":{"stepType":"replace","from":133,"to":134},"inverted":{"stepType":"replace","from":133,"to":133,"slice":{"content":[{"type":"text","text":"f"}],"openLeft":0,"openRight":0}}},{"step":{"stepType":"replace","from":132,"to":133},"inverted":{"stepType":"replace","from":132,"to":132,"slice":{"content":[{"type":"text","text":" 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I’ll keep it open in the break if you need more info.

Thx!

4

Can you get me the values of this$1.items.flatten() and this$1.eventCount? Those appear to be out of sync.

5 
JSON.stringify(this$1.items.flatten())
"[{"map":{"ranges":[129,1,0],"inverted":false}},{"map":{"ranges":[127,2,0],"inverted":false}},{"map":{"ranges":[126,1,0],"inverted":false}},{"map":{"ranges":[125,1,0],"inverted":false}},{"map":{"ranges":[124,1,0],"inverted":false}},{"map":{"ranges":[122,2,0],"inverted":false}},{"map":{"ranges":[121,1,0],"inverted":false}},{"map":{"ranges":[117,4,0],"inverted":false}},{"map":{"ranges":[116,1,0],"inverted":false}},{"map":{"ranges":[115,1,0],"inverted":false}},{"map":{"ranges":[114,1,0],"inverted":false}},{"map":{"ranges":[110,4,0],"inverted":false}},{"map":{"ranges":[109,1,0],"inverted":false}},{"map":{"ranges":[108,1,0],"inverted":false}},{"map":{"ranges":[106,2,0],"inverted":false}},{"map":{"ranges":[105,1,0],"inverted":false}},{"map":{"ranges":[104,1,0],"inverted":false}},{"map":{"ranges":[151,1,0],"inverted":false}},{"map":{"ranges":[150,1,0],"inverted":false}},{"map":{"ranges":[148,2,0],"inverted":false}},{"map":{"ranges":[147,1,0],"inverted":false}},{"map":{"ranges":[145,2,0],"inverted":false}},{"map":{"ranges":[144,1,0],"inverted":false}},{"map":{"ranges":[142,2,0],"inverted":false}},{"map":{"ranges":[141,1,0],"inverted":false}},{"map":{"ranges":[140,1,0],"inverted":false}},{"map":{"ranges":[139,1,0],"inverted":false}},{"map":{"ranges":[138,1,0],"inverted":false}},{"map":{"ranges":[137,1,0],"inverted":false}},{"map":{"ranges":[134,3,0],"inverted":false}},{"map":{"ranges":[133,1,0],"inverted":false}},{"map":{"ranges":[132,1,0],"inverted":false}},{"map":{"ranges":[131,1,0],"inverted":false}},{"map":{"ranges":[129,2,0],"inverted":false}},{"map":{"ranges":[128,1,0],"inverted":false}},{"map":{"ranges":[125,3,0],"inverted":false}},{"map":{"ranges":[124,1,0],"inverted":false}},{"map":{"ranges":[122,2,0],"inverted":false}},{"map":{"ranges":[121,1,0],"inverted":false}},{"map":{"ranges":[119,2,0],"inverted":false}},{"map":{"ranges":[119,0,2],"inverted":false},"step":null,"selection":null,"mirrorOffset":1},{"map":{"ranges":[121,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":3},{"map":{"ranges":[122,0,2],"inverted":false},"step":null,"selection":null,"mirrorOffset":5},{"map":{"ranges":[124,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":7},{"map":{"ranges":[125,0,3],"inverted":false},"step":null,"selection":null,"mirrorOffset":9},{"map":{"ranges":[128,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":11},{"map":{"ranges":[129,0,2],"inverted":false},"step":null,"selection":null,"mirrorOffset":13},{"map":{"ranges":[131,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":15},{"map":{"ranges":[132,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":17},{"map":{"ranges":[133,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":19},{"map":{"ranges":[134,0,3],"inverted":false},"step":null,"selection":null,"mirrorOffset":21},{"map":{"ranges":[137,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":23},{"map":{"ranges":[138,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":25},{"map":{"ranges":[139,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":27},{"map":{"ranges":[140,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":29},{"map":{"ranges":[141,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":31},{"map":{"ranges":[142,0,2],"inverted":false},"step":null,"selection":null,"mirrorOffset":33},{"map":{"ranges":[144,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":35},{"map":{"ranges":[145,0,2],"inverted":false},"step":null,"selection":null,"mirrorOffset":37},{"map":{"ranges":[147,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":39},{"map":{"ranges":[148,0,2],"inverted":false},"step":null,"selection":null,"mirrorOffset":41},{"map":{"ranges":[150,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":43},{"map":{"ranges":[151,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":45},{"map":{"ranges":[104,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":47},{"map":{"ranges":[105,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":49},{"map":{"ranges":[106,0,2],"inverted":false},"step":null,"selection":null,"mirrorOffset":51},{"map":{"ranges":[108,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":53},{"map":{"ranges":[109,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":55},{"map":{"ranges":[110,0,4],"inverted":false},"step":null,"selection":null,"mirrorOffset":57},{"map":{"ranges":[114,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":59},{"map":{"ranges":[115,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":61},{"map":{"ranges":[116,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":63},{"map":{"ranges":[117,0,4],"inverted":false},"step":null,"selection":null,"mirrorOffset":65},{"map":{"ranges":[121,0,1],"inverted":false},"step":null,"selection":null,"mirrorOffset":67},{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this$1.eventCount
1
6

Thanks. It appears that eventCount is being updated incorrectly, I’m going to see if I can find something that might cause that.

7

There was actually a fixme suggesting a bug exactly like this, fixed by this patch. I’ve updated the demo – could you see if you can still reproduce the issue?

8

I can still reproduce, stops in same place (Branch.prototype.popEvent:1854) I think I can only reproduce with using undo/redo but not sure …

JSON.stringify(state)
"{"doc":{"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"hjg hj ggyyhjgjjkhjkhjkh  hg hjkjhjkh jkhjhjkghjghjghkjhkjhjkh jkjghjg hjg"}]}]},"selection":{"head":27,"anchor":27}}"

preserveItems
true

end
0

JSON.stringify(this$1.items.flatten())
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this$1.eventCount
1
9

I managed to create a test that reproduced this (it was related to overrunning the max history size, and dropping old events). I’ve fixed that and updated the demos again.

1 Like