Anybody know #Java well enough to point me in the right direction here?

java.lang.NullPointerException

at java.util.Objects.requireNonNull(Objects.java:203)

at com.cloudbees.plugins.credentials.CredentialsProvider.findCredentialById(CredentialsProvider.java:874)

at org.jenkinsci.plugins.p4.client.ConnectionHelper.findCredential(ConnectionHelper.java:925)

at org.jenkinsci.plugins.p4.tagging.TagAction.getTicket(TagAction.java:218)

at org.jenkinsci.plugins.p4.build.P4EnvironmentContributor.buildEnvironment(P4EnvironmentContributor.java:87)

at org.jenkinsci.plugins.p4.build.P4EnvironmentContributor.buildEnvironment(P4EnvironmentContributor.java:32)

at org.jenkinsci.plugins.p4.PerforceScm.buildEnvironment(PerforceScm.java:725)

at hudson.scm.SCM.buildEnvVars(SCM.java:553)

at org.jenkinsci.plugins.p4.PerforceScm.buildEnvVars(PerforceScm.java:719)

at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:869)

at hudson.model.AbstractBuild$AbstractBuildExecution.decideWorkspace(AbstractBuild.java:444)

at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:488)

at hudson.model.Run.execute(Run.java:1815)

at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)

at hudson.model.ResourceController.execute(ResourceController.java:97)

at hudson.model.Executor.run(Executor.java:429)