[mobx-state-tree] Value undefined is no MST Node with Timeseries data

[kaitco]

Describe the bug
When labeling timeseries data in label studio mobx-state-tree exception is thrown. Problem came with 1.0.2. Pre 1.0.2 versions are not affected.

To Reproduce
Steps to reproduce the behavior:

1. Fresh install of v1.0.2
2. Import task as json with following entry:
   [{"csv": "https://app.heartex.ai/samples/time-series.csv?time=time&values=velocity%2Cacceleration&sep=%2C"},{"csv": "https://app.heartex.ai/samples/time-series.csv?time=time&values=velocity%2Cacceleration&sep=%2C"}]
3. Setup labeling interface with following configuration:

<View>
  <Header value="Time Series classification" style="font-weight: normal"/>
  <!-- Choices (whole signal classification) -->
    <Choices name="pattern" toName="ts">
      <Choice value="Growth"/>
      <Choice value="Decay"/>
    </Choices>
    <!-- Labels (per region classification) -->
    <TimeSeriesLabels name="label" toName="ts">
      <Label value="Run"/>
      <Label value="Walk"/>
    </TimeSeriesLabels>
    <!-- Object (source) tag for plot -->
    <TimeSeries name="ts" value="$csv" valueType="url">
      <Channel column="velocity"/>
    </TimeSeries>
</View>

3. Label region with Label 3 or 4. After submitting data an error occurs:

4. Next view is not loaded and refreshing the browser recovers everything until next label

5. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: MacOS, Windows
• Label Studio Version 1.0.2

[kaitco]

Same bug still existent in LS 1.1.0

[makseq]

Just checked in LS 1.3, it works well now.