t:collapsiblePanel leads to IE target is null or not an object

[ora1521]

I have created a collapsiblePanel as you can see below:

<t:dataList value="#{hospitalizacja.notkiObserwacje}" var="notki"
id="notkiLst" rowIndexVar="lstCnt">
           <h:column>    
                
            <h:panelGrid columns="2">

                <t:collapsiblePanel id="notkicollapsible1"
value="#{notki.collapsible}" var="notkicollapsible">
                <f:facet name="header">
                        <t:div
style="width:500px;background-color:white;color:blue">
                            <h:outputText value="#{lstCnt + 1}. Notka z dnia
"/>
                            <h:outputText value="#{notki.kiedy}  "/>
                            <t:headerLink immediate="true">
                                <t:graphicImage border="0" alt="minusImage"
url="/images/minus.gif" rendered="#{!notkicollapsible}"/>
                                <t:graphicImage border="0" alt="plusImage"
url="/images/plus.gif" rendered="#{notkicollapsible}"/>
                            </t:headerLink>
                        </t:div>
                 </f:facet>

                <h:outputText styleClass="tabcontent" value="Rodzaj"/>
                <h:selectOneMenu id="rodzajNotkiWybor"
value="#{notki.rodzaj}">
                        <f:selectItems
value="#{hospitalizacja.rodzajNotekSlownik}" />
                        <f:valueChangeListener
type="com.pac5.NewHospSessionBean"/>
                        <f:converter converterId="lekarzeConverter"/>
                </h:selectOneMenu>
                <h:outputText styleClass="tabcontent" value="Autor"/>
                <h:selectOneMenu id="autorWybor" value="#{notki.lekarzId}">
                        <f:selectItems
value="#{hospitalizacja.lekarzeSlownik}" />
                        <f:valueChangeListener
type="com.pac5.NewHospSessionBean"/>
                        <f:converter converterId="lekarzeConverter"/>
                </h:selectOneMenu>
                <h:outputText styleClass="tabcontent" value="Data notki"/>
                <t:inputCalendar id="mynotka" value="#{notki.kiedy}"
renderAsPopup="true" popupTodayString="Dzis jest"
popupDateFormat="yyyy-MM-dd" renderPopupButtonAsImage="true">
                <f:convertDateTime pattern="yyyy-MM-dd"/>
                </t:inputCalendar>
               <t:inputTextarea id="mylekstopdate" value="#{notki.tresc}"
rows="10" cols="80"/>
              
                </t:collapsiblePanel>
                <t:htmlTag value="br"/>
                </h:panelGrid>
                </h:column>

            </t:dataList>

When I have started IE I have received JavaScript error Error: 'target' is
null or not an object.

Source examination leads to javascript function and particular line below:

(...)
        function oamSubmitForm(formName, linkId, target, params)
        {
(...)           
                var oldTarget = form.target;

I have no idea what to do? I have browsed a lot of posts and websites and
have no clue what is going on... Some bug in Tomahawk version 1.1.9?



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