Jmeter + Jruby-JSR223 options. Request + jmeter properties not assigned for more than 4 threads

I have set up a JMeter Ant task that gives a JMeter request with 3 properties already assigned for a JMeter Test Plan (JMX),

I read these properties in a Jruby script (JSR223 sampler) as shown below (for the first 4 streams, it gets all 3 property values ​​correctly and assigns them to local variables (pvalue1mpvalue2) ..

pvalue1=$props.get("prop1")
pvalue2=$props.get("prop2")
pvalue3=$props.get("prop3")

      

        
        
        
      

    

But the problem is that from thread # 5, it starts throwing below exception

 [jmeter] Jruby Exception is     undefined method 'get' for nil:NilClass
 [jmeter] Jruby backtrace is   ["<script>:157:in '(root)'"]

      

        
        
        
      

    

I have a java_import like this in my jruby ...

java_import 'java.util.Properties'