Steps to reproduce:
1. Open the attached project ("1208387.zip") or open a new project and install Unity Recorder package
2. Open the Recorder Window (Window -> General -> Recorder -> Recorder Window)
3. Add a new "GIF Animation" recorder
4. Enter Play mode and press Pause
5. Press "START RECORDING" and then "STOP RECORDING"

Reproducible with: Unity Recorder 2.0.3 (2020.1.0a18), 2.1.0 (2018.4.15f1, 2019.2.17f1, 2019.3.0f5, 2020.1.0a18)
Not reproducible with: Unity Recorder 2.0.0 (2020.1.0a18), 2.0.1 (2020.1.0a18), 2.0.2 (2020.1.0a18)

First 5 lines of the stacktrace:
UnityEditor.Recorder.FrameCapturer.fcAPI:fcReleaseStream
UnityEditor.Recorder.FrameCapturer.fcAPI/fcStream:Release
UnityEditor.Recorder.GIFRecorder:EndRecording
UnityEditor.Recorder.RecordingSession:EndRecording
UnityEditor.Recorder.RecorderController:StopRecording