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I have a problem regarding running jp@gc-Graph Generator plugin more than two times in my TestPlan in JMeter. I get following stacktrace in Log Viewer panel :

2020-08-25 17:23:29,114 INFO o.a.j.e.DistributedRunner: Configuring remote engine: 192.168.1.5
2020-08-25 17:23:29,115 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,119 INFO o.a.j.e.DistributedRunner: Starting distributed test with remote engines: [192.168.1.5] @ Tue Aug 25 17:23:29 CEST 2020 (1598369009119)
2020-08-25 17:23:29,120 INFO o.a.j.e.ClientJMeterEngine: running clientengine run method
2020-08-25 17:23:29,122 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,122 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,123 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,123 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,135 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,135 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,136 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,136 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,136 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,136 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,136 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,136 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,136 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,137 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,137 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,137 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,137 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,137 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,138 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,138 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,138 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,138 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,138 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,138 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,138 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,139 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,139 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,139 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,139 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,139 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,139 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,139 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,139 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,139 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,140 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,140 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,140 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,140 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,140 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,140 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,140 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,140 INFO o.a.j.r.RmiUtils: Disabling SSL for RMI as server.rmi.ssl.disable is set to 'true'
2020-08-25 17:23:29,141 INFO o.a.j.s.BatchSampleSender: Using batching (client settings) for this run. Thresholds: num=100, time=60000
2020-08-25 17:23:29,141 INFO o.a.j.s.DataStrippingSampleSender: Using DataStrippingSampleSender for this run
2020-08-25 17:23:29,183 INFO o.a.j.e.ClientJMeterEngine: sent test to 192.168.1.5 basedir='JMX-files/TestPlanS'
2020-08-25 17:23:29,183 INFO o.a.j.e.ClientJMeterEngine: Sending properties {}
2020-08-25 17:23:29,194 INFO o.a.j.e.ClientJMeterEngine: sent run command to 192.168.1.5
2020-08-25 17:23:29,194 INFO o.a.j.e.DistributedRunner: Remote engines have been started:[192.168.1.5]
2020-08-25 17:23:29,234 ERROR k.a.j.j.JMXMonSampler: The client has been closed.

2020-08-25 17:23:29,292 ERROR k.a.j.j.JMXMonSampler: The client has been closed.
2020-08-25 17:23:29,361 INFO o.a.j.g.u.JMeterMenuBar: setRunning(true, 192.168.1.5)
2020-08-25 17:23:30,245 ERROR k.a.j.j.JMXMonSampler: The client has been closed.
// ... a LOT of SAME ERROR messages
2020-08-25 17:23:50,124 ERROR k.a.j.j.JMXMonSampler: The client has been closed.
2020-08-25 17:23:51,413 INFO o.a.j.g.u.JMeterMenuBar: setRunning(false, 192.168.1.5)

This is screenshot of my TestPlan: enter image description here

As you can see I've disabled SSHMon Sample Collector Listener

Also, due to problem running Graph Generator plugin (i.e. generating graphs for real) I've mannually added JMeter-Extras.jar file in lib/ext directory of my apache-jmeter installation by following this answer. That didn't help, so later I've found this answer from @Dmitri T and installed Synthesis Report and Graph Generator worked as it should. Later I've installed SSHMon Sample Collector and since then I'm having this issue which is dipslayed in stacktrace and no CSV results, nor graphs are being genreated IFF Test Plan is ran more than 2 times.

Any help/advice is more than greatly appreciated.

P.S. I'm using JMeter 5.2.1, Fedora 31 64-bit OS and Java 8 (build 1.8.0_161-b12).

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