nagarajgond opened a new issue, #6543:
URL: https://github.com/apache/incubator-kie-drools/issues/6543

   ### Description
   
   Below rule throws NullPointerException. Please help me to understand what is 
wrong with this rule.
   
   ### Steps to Reproduce
   Clone this repo [code](https://github.com/nagarajgond/drools-rule)
   Run RuleProvider.java
   
   
   ### Error
   ```
   Exception in thread "main" java.lang.RuntimeException: 
java.lang.NullPointerException: Cannot invoke 
"org.drools.base.rule.Declaration.getTupleIndex()" because "declaration" is null
        at 
org.drools.core.common.ActivationsManager.handleException(ActivationsManager.java:87)
        at 
org.drools.core.phreak.RuleExecutor.fireActivationEvent(RuleExecutor.java:445)
        at 
org.drools.core.phreak.RuleExecutor.fireActivation(RuleExecutor.java:416)
        at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:155)
        at 
org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:92)
        at 
org.drools.core.concurrent.AbstractGroupEvaluator.evaluateAndFire(AbstractGroupEvaluator.java:48)
        at 
org.drools.core.impl.ActivationsManagerImpl.fireLoop(ActivationsManagerImpl.java:309)
   ```
   
   ```
   package com.test.drl;
   
   unit PolicyUnit;
   
   import com.test.drl.BasicIpUtils;
   import com.test.drl.StringUtils;
   global com.test.drl.ListManager listManager;
   
   rule "rule5_preprocess1"
        salience -997
        when
                 ($f: /facts [ name == "address", value == "1.1.1.1" ])
                 or ( not $f: /facts [ name == "location.city" ] )
                 or (  $f: /facts [ name == "address", value == "1.1.1.2"])
        then
                $f.setPreprocess1(true);
                facts.update($f);
                System.out.println("rule5_preprocess1 fired for fact: " + $f);
   end
   ```
   


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