checkout fails due to issue with JGit 5.0.2 (in 3.0.0.beta-5)

java.lang.NoSuchMethodError: org.eclipse.jgit.lib.Repository.getRef(Ljava/lang/String;)Lorg/eclipse/jgit/lib/Ref;
 at jenkins.plugins.git.GitSCMFileSystem$1.invoke(GitSCMFileSystem.java:117)
 at jenkins.plugins.git.GitSCMFileSystem$1.invoke(GitSCMFileSystem.java:114)
 at jenkins.plugins.git.GitSCMFileSystem$3.invoke(GitSCMFileSystem.java:193)
 at org.jenkinsci.plugins.gitclient.AbstractGitAPIImpl.withRepository(AbstractGitAPIImpl.java:28)
 at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.withRepository(CliGitAPIImpl.java:75)
 at jenkins.plugins.git.GitSCMFileSystem.invoke(GitSCMFileSystem.java:189)
 at jenkins.plugins.git.GitSCMFileSystem.<init>(GitSCMFileSystem.java:114)
 at jenkins.plugins.git.GitSCMFileSystem$BuilderImpl.build(GitSCMFileSystem.java:353)
 at jenkins.scm.api.SCMFileSystem.of(SCMFileSystem.java:196)
 at jenkins.scm.api.SCMFileSystem.of(SCMFileSystem.java:172)
 at org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition.create(CpsScmFlowDefinition.java:108)
 at org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition.create(CpsScmFlowDefinition.java:67)
 at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:303)
 at hudson.model.ResourceController.execute(ResourceController.java:97)
 at hudson.model.Executor.run(Executor.java:429)
Finished: FAILURE