I have a problem where if I have a globally configured shared library and I want to use it in a build I get the following error:

java.lang.NullPointerException
  at org.jenkinsci.plugins.workflow.libs.LibraryStep$Execution.run(LibraryStep.java:171)
  at org.jenkinsci.plugins.workflow.libs.LibraryStep$Execution.run(LibraryStep.java:154)
  at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:47)
  at hudson.security.ACL.impersonate(ACL.java:367)
  at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:44)
  at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
  at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
  at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
  at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
  at java.base/java.lang.Thread.run(Thread.java:834)

One workaround is to delete the library '...' line from the Jenkinsfile and make the shared lib implicitly included
The Jenkinsfile in question looks like this:
library 'tsc-pipelines@master'
java()