Can't end calls on web with SIPUAHelper's hangup

[IvoB1987]

Describe the bug
Can't end calls on web

To Reproduce
Steps to reproduce the behavior:

1. Start a call
2. Use SIPUAHelper's call.hangup method to end the call

Expected behavior
That it ends the call

System Infomation()
Flutter SDK Version: Flutter (Channel stable, 3.22.2)
sip_ua verisons 1.0.1
Target OS and Version: Chrome Version 135.0.7049.42 (Official Build) (64-bit)
Host OS and Version: Microsoft Windows [Version 10.0.26100.3476]

Stacktrace:

DartError: Unexpected null value.
../dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 296:3                       throw_
../dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 586:18                  nullCheck
../packages/dart_webrtc/src/rtc_peerconnection_impl.dart 336:68                                      <fn>
../dart-sdk/lib/internal/iterable.dart 425:31                                                        elementAt
../dart-sdk/lib/internal/iterable.dart 354:26                                                        moveNext
../dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 918:20                  next
../dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 483:14                                of
../dart-sdk/lib/internal/iterable.dart 224:7                                                         toList
../packages/dart_webrtc/src/rtc_peerconnection_impl.dart 336:64                                      getLocalStreams
../packages/sip_ua/src/sip_ua_helper.dart 562:35                                                     hangup

From what I understand WebRTC's RTCPeerConnection API no longer supports getLocalStreams() on web so it shouldn't be used anymore, but I'm not sure. I was able to workaround it by just calling call.session.terminate(); instead but I'm not sure if that's the best way to do it. The bug seems to be introduced with version 1.0.0 of sip_ua where the if (peerConnection != null) block was introduced in the hangup function