Custom module Pager does not work with Ajax filter

My custom module uses an Ajax enabled drop down to allow users to filter images. There is also a pager attached to the query. The pager works fine when all the data is displayed i.e. no filter applied but after applying a filter, clicking a pager button just gives a white screen.

Here is my code.

function view_colouring_sheets($form, $form_state){ $query = db_select('field_data_field_image','fi')->extend('PagerDefault'); $query->join('node','n','n.nid = fi.entity_id'); $query->fields('fi'); $query->fields('n',array('title')); $query->limit(20); if($form_state['input']['tid']){     $query->condition('entity_id',  colouring_sheets_filtered_tid($form_state['input']['tid']),'in'); } $images = $query->execute()->fetchAll();   $output = array(     '#theme'=>'image_matrix',     '#type'=>'markup',     '#images'=>$images,     '#title'=>'Colouring Sheets',     '#pager'=>theme('pager'),     '#filter_form'=>  drupal_render(drupal_get_form('image_filter_form')), );  return $output; }     function colouring_sheets_filtered_tid($tid){     $query = db_select('field_data_field_image_category','ic');     $query->condition('field_image_category_tid',$tid);     $query->fields('ic');     $result = $query->execute()->fetchAll();     $term_array = array();     foreach($result as $row){         $term_array[] = $row->entity_id;     }     return $term_array; }  function image_filter_form($form, $form_state){     $terms = taxonomy_get_tree(18);     $terms_array = array();     foreach($terms as $term){         $terms_array[$term->tid] = $term->name;     }     $form['tid'] = array(         '#type'=>'select',         '#options'=>$terms_array,         '#required'=>TRUE,         '#title'=>'Fitler Images',         '#ajax'=>array(             'method'=>'replace',             'wrapper'=>'image_matrix',             'callback'=>'view_colouring_sheets',             'progress' => array('type' => 'throbber', 'message' => 'Images Loading'),             'effect'=>'fade',         ),     );     return $form; } 
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Custom module Pager does not work with Ajax filter

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