jQuery Grid Plugin - jqGrid

When enter has been pressed after input a text as a filter in Search Box page is reloading.

Steps to reproduce:

1. Click icon search at the bottom left of the grid so search box will appear.

2. Add rule.

3. Type any keyword at input field (text field) as a filter.

4. Press enter from keyboard.

Actual result : whole page is reloading instead the grid do the search.

Expected result : the grid do the search with the filter.