Issue Passing list of custom object from lightning component to apex controller [duplicate]

Question

I am having real issues passing a list of my Transaction__c object from my lightning controller into my apex controller my transactions apex:attribute is like so:

<aura:attribute name="transactions" type="Transaction__c[]"/>

And my lightning controller method is:

addTransactions : function(component, event) {
//var transactionList = component.get("v.transactions");
var action = component.get("c.insertTransactions");
    action.setParams({
        tList : component.get("v.transactions")
    })
    action.setCallback(this, function(response) {
        var state = response.getState();
        if(state === "SUCCESS"){
            alert("From Server: " + response.getReturnValue());
        }
        else{
            console.log('ERROR:' + state + response.getError());
        }
    });
    $A.enqueueAction(action)
}

And my apex controller method is:

@AuraEnabled
public static List<Transaction__c> insertTransactions(List<Transaction__c> tList) {
    try{
    insert tList;
    }
    catch(exception e){
        System.debug('error inserting transactions @ ' + e);
    }
return tList;
}

In the console log the error I am recieving is:

ERROR = message: Unable to read sObject

Is there a specific way to pass lists because I must be missing something.

An example of the array that would be passed looks like this in the console: