All jobs that finish successfully and trigger a call to another Jenkins job with the Parameterized Trigger plugin fail with a NullPointerException. All these triggers had previously been working. The stack trace is below.

ERROR: Failed to build parameters to trigger project: Test-Config-Deploy
java.lang.NullPointerException
at java.base/java.util.regex.Matcher.getTextLength(Matcher.java:1770)
at java.base/java.util.regex.Matcher.reset(Matcher.java:416)
at java.base/java.util.regex.Matcher.<init>(Matcher.java:253)
at java.base/java.util.regex.Pattern.matcher(Pattern.java:1133)
at hudson.plugins.global_variable_string_parameter.GlobalVariableStringParameterDefinition.replaceGlobalVars(GlobalVariableStringParameterDefinition.java:132)
at hudson.plugins.global_variable_string_parameter.GlobalVariableStringParameterDefinition.getDefaultParameterValue(GlobalVariableStringParameterDefinition.java:84)
at hudson.plugins.global_variable_string_parameter.GlobalVariableStringParameterDefinition.getDefaultParameterValue(GlobalVariableStringParameterDefinition.java:53)
at hudson.plugins.parameterizedtrigger.DefaultParameterValuesActionsTransform.getDefaultParameters(DefaultParameterValuesActionsTransform.java:28)
at hudson.plugins.parameterizedtrigger.DefaultParameterValuesActionsTransform.transformParametersAction(DefaultParameterValuesActionsTransform.java:15)
at hudson.plugins.parameterizedtrigger.ProjectSpecificParametersActionFactory.getProjectSpecificBuildActions(ProjectSpecificParametersActionFactory.java:32)
at hudson.plugins.parameterizedtrigger.BuildTriggerConfig.getBuildActions(BuildTriggerConfig.java:378)
at hudson.plugins.parameterizedtrigger.ParameterizedDependency.shouldTriggerBuild(ParameterizedDependency.java:64)
at hudson.tasks.BuildTrigger.execute(BuildTrigger.java:272)
at hudson.model.AbstractBuild$AbstractBuildExecution.cleanUp(AbstractBuild.java:716)
at hudson.model.Build$BuildExecution.cleanUp(Build.java:193)
at hudson.model.Run.execute(Run.java:1935)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:99)
at hudson.model.Executor.run(Executor.java:432)
Finished: SUCCESS