Uncomplete constraint evaluation during jittng process

For complex constraints (like the one reported in the Exception stack trace) the jitting process of the constraint itsefl fails with the following Exception:

java.lang.RuntimeException: Null accessor on node: ((((me1Fact != Literal<null>) && (null == $leftMe1Pin)) || ((me2Fact != Literal<null>) && (null == $leftMe1Pin))) || ((me3Fact != Literal<null>) && (null == $leftMe1Pin)))
at org.drools.rule.constraint.ConditionAnalyzer.analyzeNode(ConditionAnalyzer.java:241) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.ConditionAnalyzer.analyzeSingleCondition(ConditionAnalyzer.java:127) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.ConditionAnalyzer.analyzeCondition(ConditionAnalyzer.java:99) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.ConditionAnalyzer.analyzeCombinedCondition(ConditionAnalyzer.java:135) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.ConditionAnalyzer.analyzeCondition(ConditionAnalyzer.java:91) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.ConditionAnalyzer.analyzeCondition(ConditionAnalyzer.java:70) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.MvelConditionEvaluator.getAnalyzedCondition(MvelConditionEvaluator.java:83) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.MvelConstraint.executeJitting(MvelConstraint.java:269) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.MvelConstraint.jitEvaluator(MvelConstraint.java:229) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.MvelConstraint.forceJitEvaluator(MvelConstraint.java:222) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:191) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]
at org.drools.rule.constraint.MvelConstraint.isAllowedCachedRight(MvelConstraint.java:183) ~[drools-core-5.5.0-SNAPSHOT.jar:5.5.0-SNAPSHOT]