[SalesForce] Cannot read property of null – ERROR lightning component

I created a lightning component which handles a record creation using a form.
The component is on Account layout.
The problem is that on some accounts, we get this error but it's not consistent.
I mean on some accounts we don't get the error and the main issue is that when we get the error and then we refresh the page couple of times, the error disappears and doesn't show anymore on that specific account.

Did anyone face the problem and know what to do ?

Update:
What I'm doing is – I check on which object the component is, then I update the force:recordData with the corrected account id and I reload the record.
After that, I'm using its fields in another logic.

Component:

<!-- account record -->
<force:recordData aura:id="accountRecordData" layoutType="FULL"
              targetRecord="{!v.accountRecord}"
              recordId="{!v.accountRecordId}"
              targetFields="{!v.accountRecordFields}" />

<!-- current record -->
<force:recordData layoutType="FULL"
              targetRecord="{!v.currentRecord}"
              recordId="{!v.recordId}"
              targetFields="{!v.currentRecordFields}" 
              recordUpdated="{!c.initAccount}"/>

Controller:

initAccount : function(component, event, helper){

    var objectName = component.get("v.sObjectName");
    var currentRecordFields = component.get("v.currentRecordFields");

    if (objectName === "Account"){
        console.log("Account record");
        component.set("v.accountRecordId", component.get("v.recordId"));
    }
    else if (objectName === "Opportunity"){
        console.log("Opportunity record");
        component.set("v.accountRecordId", currentRecordFields.AccountId);
    }
    else if (objectName === "Hand_Over__c"){
        console.log("handover record");
        component.set("v.accountRecordId", currentRecordFields.Account_Name__c);
    }

    component.find("accountRecordData").reloadRecord();
    cosole.log("");
    helper.prePopulateFields(component);
    helper.showInfoMessage(component);
}

Helper:

showInfoMessage : function(component){
    var accountRecordFields = component.get("v.accountRecordFields");
    console.log("101 accountRecordFields: " + JSON.stringify(accountRecordFields));

    if (accountRecordFields.Account_Should_Be_Stopped__c === 0 || accountRecordFields.Credit_Max_Invoice_Date__c){
        component.set("v.isValidationError",true);
        component.set("v.messageType","info");
        component.set("v.message", $A.get("$Label.c.Account_should_be_stopped_message"));
    }
}