Notice: Undefined index: help topic in views/plugins/views_plugin_display.inc on line 2157

In views UI unable to save pager settings, on strict setting of apache. Getting following error:

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /admin/structure/views/ajax/display/gallery/block_1/pager_options
StatusText: OK
ResponseText:
( ! ) Notice: Undefined index: help topic in /home/pity/workspace/birding/sites/all/modules/contrib/views/plugins/views_plugin_display.inc on line 2157
Call Stack
#TimeMemoryFunctionLocation
10.0002409848{main}( )../index.php:0
20.442136581848menu_execute_active_handler( )../index.php:21
30.458238062288call_user_func_array
( )../menu.inc:517
40.458238062820views_ui_ajax_form( )../menu.inc:0
50.459238150228views_ajax_form_wrapper( )../admin.inc:2943
60.459438164884drupal_build_form( )../ajax.inc:236
70.459538167136drupal_retrieve_form( )../form.inc:339
80.459538168336call_user_func_array
( )../form.inc:799
90.459538168652views_ui_edit_display_form( )../form.inc:0
100.493640101332views_plugin_display_block->options_form( )../admin.inc:3274
110.493640101332views_plugin_display->options_form( )../views_plugin_display_block.inc:129
[{"command":"settings","settings":{"basePath":"\/","pathPrefix":"","ajaxPageState":{"theme":"birdinggame","theme_token":"1l1s5jLCFjo1uTYmvV4yL7NLmdsHySZHyQyCttebbUE","js":{"misc\/form.js":1}},"CTools":{"dependent":{"edit-pager-options-expose-items-per-page-label":{"values":{"edit-pager-options-expose-items-per-page":[1]},"num":1,"type":"hide"},"edit-pager-options-expose-items-per-page-options":{"values":{"edit-pager-options-expose-items-per-page":[1]},"num":1,"type":"hide"},"edit-pager-options-expose-items-per-page-options-all-label":{"values":{"edit-items-per-page-options-all":[1]},"num":1,"type":"hide"},"edit-pager-options-expose-offset-label":{"values":{"edit-pager-options-expose-offset":[1]},"num":1,"type":"hide"}}}},"merge":true},{"command":"insert","method":"prepend","selector":"head","data":"\u003Cscript type=\u0022text\/javascript\u0022 src=\u0022http:\/\/birding-local.com\/misc\/form.js?v=7.24\u0022\u003E\u003C\/script\u003E\n","settings":null},...