Hi All

I am getting this error when i write the ontabenter function on the tab.

<apex:tab label="Billing" name="billName" id="tabBilling" ontabenter="callCon('Billing');" style="background-color:white;"  rendered="{!IF(strSearchlevel='1',false,true)}">

<apex:outputText value="{!IF(lstDisputeInfo.size>0,'Yes','No')}" label="Account In Dispute" />

 <apex:actionFunction name="callCon" oncomplete="callCon1();">
                        <apex:param name="firstParam" value="" assignTo="{!Tabselected}"/>
                        </apex:actionFunction>

Below is the error. when i remove the ontabenter action it is not throwing the error, but i need to write the ontabenter action in order to capture the clicks on the tab. Please let me know your taughts on this.Appreciate your time and help.

The value 'null' is not valid for operator '>'