[rules-users] fireAllRules fire an exception !

[hypnosat7]

Hi,
I try to execute this code :
  		session.startProcess(ruleFlowId);
		session.insert(fact);
		session.fireAllRules();

But I have a NullPointerEception :

java.lang.NullPointerException
	at mipih.Rule_Correction_acte_0.consequence(Rule_Correction_acte_0.java:15)
	at
mipih.Rule_Correction_acte_0ConsequenceInvoker.evaluate(Rule_Correction_acte_0ConsequenceInvoker.java:23)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:545)
	at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:509)
	at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:430)
	at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:392)

Any help pls
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