java.lang.StringIndexOutOfBoundsException: begin -2, end 1, length 0
	at java.base/java.lang.String.checkBoundsBeginEnd(String.java:4606)
	at java.base/java.lang.String.substring(String.java:2709)
	at org.codehaus.groovy.runtime.StringGroovyMethods.getAt(StringGroovyMethods.java:1487)
	at org.codehaus.groovy.runtime.StringGroovyMethods.getAt(StringGroovyMethods.java:1474)
	at org.codehaus.groovy.runtime.dgm$1088.doMethodInvoke(Unknown Source)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1225)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
	at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:46)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:128)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker$11.call(Checker.java:512)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.GroovyInterceptor.onGetArray(GroovyInterceptor.java:124)
	at PluginClassLoader for script-security//org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onGetArray(SandboxInterceptor.java:476)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker$11.call(Checker.java:509)
	at PluginClassLoader for script-security//org.kohsuke.groovy.sandbox.impl.Checker.checkedGetArray(Checker.java:514)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.sandbox.SandboxInvoker.getArray(SandboxInvoker.java:45)
	at PluginClassLoader for workflow-cps//org.jenkinsci.plugins.workflow.cps.LoggingInvoker.getArray(LoggingInvoker.java:201)
	at PluginClassLoader for workflow-cps//com.cloudbees.groovy.cps.impl.ArrayAccessBlock.rawGet(ArrayAccessBlock.java:21)
	at Script1.archiveChildJobTap(Script1.groovy:1638)