Jenkins node disappear after adding new node
I add the new node through Jenkins GUI and I have about 118 active nodes. After the addition the new node appears but one of the already existing nodes disappears and any job running on the disappeared node starts to throw the following java exception
Execution of script [machine_clean.groovy] failed - java.lang.NullPointerException: Cannot
invoke method getChannel() on null object
org.jenkinsci.plugins.scriptler.util.GroovyScript$ScriptlerExecutionException: java.lang.NullPointerException: Cannot invoke method getChannel() on null object
at org.jenkinsci.plugins.scriptler.util.GroovyScript.call(GroovyScript.java:132)
at hudson.remoting.LocalChannel.call(LocalChannel.java:47)
at org.jenkinsci.plugins.scriptler.builder.ScriptlerBuilder.perform(ScriptlerBuilder.java:242)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:814)
at hudson.model.Build$BuildExecution.build(Build.java:199)
at hudson.model.Build$BuildExecution.doRun(Build.java:164)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:522)
at hudson.model.Run.execute(Run.java:1896)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:44)
at hudson.model.ResourceController.execute(ResourceController.java:101)
at hudson.model.Executor.run(Executor.java:442)
Caused by: java.lang.NullPointerException: Cannot invoke method getChannel() on null object
at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91)
at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:47)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:34)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at hudson.slaves.SlaveComputer$getChannel.call(Unknown Source)
at Script1.run(Script1.groovy:54)
at org.jenkinsci.plugins.scriptler.util.GroovyScript.call(GroovyScript.java:123)
Is there a limit on the number of supported node/executors? any idea how to fix this?