NullPointerException while executing DRL in RHDM 7.x

Issue

• Rules are authored as below

rule Rule1
when
  not String()
  List() from collect (Integer() from new Integer [] {1,2})
  Boolean() // always false
then
end

rule Rule2
when
  not String()
  List() from collect (Integer() from new Integer [] {1,2})
 then
  insert(new String());
end

Rule execution is failing with NPE:

java.lang.NullPointerException
    at org.drools.core.common.TupleSetsImpl.setNextTuple(TupleSetsImpl.java:349)
    at org.drools.core.common.TupleSetsImpl.removeInsert(TupleSetsImpl.java:167)
    at org.drools.core.phreak.RuleNetworkEvaluator.doRiaNode2(RuleNetworkEvaluator.java:705)
    at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:334)
    at org.drools.core.phreak.RuleNetworkEvaluator.doRiaNode(RuleNetworkEvaluator.java:631)
    at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:554)
    at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:386)
    at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:346)
    at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:182)
    at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:140)
    at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:235)
    at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:179)
    at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleEx