Channel form php version issue on MSM #4902

Warning
Attempt to read property "show_field_names" on null

ee/ExpressionEngine/Addons/grid/libraries/Grid_lib.php, line 84

           {exp:channel:form channel="contact" error_handling="inline" site="default_site"}
            <br>
            {global_errors}{field} :{error}{/global_errors}<br><br>
            {field_errors}
            
            {field}: {error}<br>

            {/field_errors}
            <br><br>
            
                <fieldset>
                    <label for="title">Title</label>
                    <input type="text" name="title" id="title" value="{title}" size="50" maxlength="200" onkeyup="liveUrlTitle(event);">
                    {error:title}
                </fieldset>

                <fieldset>
                    <label for="url_title">URL Title</label>
                    <input type="text" name="url_title" id="url_title" value="{url_title}" maxlength="200" size="50">
                    {error:url_title}
                </fieldset>

                                        <fieldset class="element-wrapper text-wrap">
                        <label for="contact_email" class="element-label">Contact Email</label>
                        {field:contact_email}
                        {error:contact_email}
                    </fieldset>
                                        <fieldset class="element-wrapper text-wrap">
                        <label for="contact_phone" class="element-label">Contact Phone</label>
                        {field:contact_phone}
                        {error:contact_phone}
                    </fieldset>
                                        <fieldset class="element-wrapper grid-wrap">
                        <label for="contact_address" class="element-label">Contact Address</label>
                        {field:contact_address}
                        {error:contact_address}
                    </fieldset>
                                        <fieldset class="element-wrapper textarea-wrap">
                        <label for="page_content" class="element-label">Page Content</label>
                        {field:page_content}
                        {error:page_content}
                    </fieldset>
                                        <fieldset class="element-wrapper text-wrap">
                        <label for="seo_title" class="element-label">SEO Title</label>
                        {field:seo_title}
                        {error:seo_title}
                    </fieldset>
                                        <fieldset class="element-wrapper textarea-wrap">
                        <label for="seo_desc" class="element-label">SEO Description</label>
                        {field:seo_desc}
                        {error:seo_desc}
                    </fieldset>
                <button type="submit">Submit</button>
            {/exp:channel:form}