Pull up crashes when pubspec.yaml contains dependency not found in lockfile

[Felix Barz (Brickmakers)]

$ git commit -m "use final fields instead of getters"
> Running pre_commit hook...
Scanning lib/src/firebase_account.dart...
Scanning lib/src/firebase_auth.dart...
Scanning lib/src/profile_update.dart...
Scanning lib/src/rest_api.dart...
Running dart analyze...
0 issue(s) found.
Checking for updates packages...
Unhandled exception:
NoSuchMethodError: The method '>' was called on null.
Receiver: null
Tried calling: >(Instance of 'Version')
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1      PullUpDependencies._pullUpVersions (package:dart_pre_commit/src/pull_up_dependencies.dart:99:31)
#2      PullUpDependencies.call (package:dart_pre_commit/src/pull_up_dependencies.dart:32:21)
<asynchronous suspension>
#3      Hooks.call (package:dart_pre_commit/src/hooks.dart:224:38)
<asynchronous suspension>
#4      main (file:///C:/Users/felix.barz/repos/other/firebase_rest_auth/tool/pre_commit.dart:9:29)
<asynchronous suspension>
#5      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:299:32)
#6      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)

> Error detected in pre_commit hook.