diff --git a/docs/en_US/release_notes_4_2.rst b/docs/en_US/release_notes_4_2.rst
index 4182147ed..59f08c84f 100644
--- a/docs/en_US/release_notes_4_2.rst
+++ b/docs/en_US/release_notes_4_2.rst
@@ -37,6 +37,7 @@ Bug fixes
 | `Bug #3872 <https://redmine.postgresql.org/issues/3872>`_ - Ensure object names in external process dialogues are properly escaped.
 | `Bug #3891 <https://redmine.postgresql.org/issues/3891>`_ - Correct order of Save and Cancel button for json/jsonb editing.
 | `Bug #3897 <https://redmine.postgresql.org/issues/3897>`_ - Data should be updated properly for FTS Configurations, FTS Dictionaries, FTS Parsers and FTS Templates.
+| `Bug #3903 <https://redmine.postgresql.org/issues/3903>`_ - Fixed Query Tool Initialization Error.
 | `Bug #3908 <https://redmine.postgresql.org/issues/3908>`_ - Fixed keyboard navigation for Select2 and Privilege cell in Backgrid.
 | `Bug #3929 <https://redmine.postgresql.org/issues/3929>`_ - Fix alignment of help messages in properties panels.
 | `Bug #3935 <https://redmine.postgresql.org/issues/3935>`_ - Ensure that grant wizard should list down functions for EPAS server running with no-redwood-compat mode.
\ No newline at end of file
diff --git a/web/pgadmin/tools/datagrid/__init__.py b/web/pgadmin/tools/datagrid/__init__.py
index 709e164f5..ded06dec4 100644
--- a/web/pgadmin/tools/datagrid/__init__.py
+++ b/web/pgadmin/tools/datagrid/__init__.py
@@ -306,8 +306,15 @@ def initialize_query_tool(sgid, sid, did=None):
         did: Database Id
     """
     connect = True
-    if ('recreate' in request.args and
-            request.args['recreate'] == '1'):
+    reqArgs = None
+    # Read the data if present. Skipping read may cause connection
+    # reset error if data is sent from the client
+    if request.data:
+        reqArgs = request.data
+
+    reqArgs = request.args
+    if ('recreate' in reqArgs and
+            reqArgs['recreate'] == '1'):
         connect = False
     # Create asynchronous connection using random connection id.
     conn_id = str(random.randint(1, 9999999))
diff --git a/web/pgadmin/tools/datagrid/static/js/datagrid.js b/web/pgadmin/tools/datagrid/static/js/datagrid.js
index 851d53ff3..ea61dd7ae 100644
--- a/web/pgadmin/tools/datagrid/static/js/datagrid.js
+++ b/web/pgadmin/tools/datagrid/static/js/datagrid.js
@@ -407,11 +407,20 @@ define('pgadmin.datagrid', [
         if (recreate) {
           baseUrl += '?recreate=1';
         }
+
+        /* Send the data only if required. Sending non required data may
+         * cause connection reset error if data is not read by flask server
+         */
+        let reqData = null;
+        if(sql_filter != '') {
+          reqData = JSON.stringify(sql_filter);
+        }
+
         $.ajax({
           url: baseUrl,
           method: 'POST',
           dataType: 'json',
-          data: JSON.stringify(sql_filter),
+          data: reqData,
           contentType: 'application/json',
         })
         .done(function(res) {
diff --git a/web/pgadmin/tools/sqleditor/static/js/sqleditor.js b/web/pgadmin/tools/sqleditor/static/js/sqleditor.js
index 78d368c92..885d02b9d 100644
--- a/web/pgadmin/tools/sqleditor/static/js/sqleditor.js
+++ b/web/pgadmin/tools/sqleditor/static/js/sqleditor.js
@@ -96,7 +96,6 @@ define('tools.querytool', [
       'click #btn-include-filter': 'on_include_filter',
       'click #btn-exclude-filter': 'on_exclude_filter',
       'click #btn-remove-filter': 'on_remove_filter',
-      'click #btn-apply': 'on_apply',
       'click #btn-cancel': 'on_cancel',
       'click #btn-copy-row': 'on_copy_row',
       'click #btn-paste-row': 'on_paste_row',
@@ -1475,18 +1474,6 @@ define('tools.querytool', [
       );
     },
 
-    // Callback function for ok button click.
-    on_apply: function() {
-      var self = this;
-
-      // Trigger the apply_filter signal to the SqlEditorController class
-      self.handler.trigger(
-        'pgadmin-sqleditor:button:apply_filter',
-        self,
-        self.handler
-      );
-    },
-
     // Callback function for cancel button click.
     on_cancel: function() {
       $('#filter').addClass('d-none');
@@ -2084,7 +2071,6 @@ define('tools.querytool', [
         self.on('pgadmin-sqleditor:button:include_filter', self._include_filter, self);
         self.on('pgadmin-sqleditor:button:exclude_filter', self._exclude_filter, self);
         self.on('pgadmin-sqleditor:button:remove_filter', self._remove_filter, self);
-        self.on('pgadmin-sqleditor:button:apply_filter', self._apply_filter, self);
         self.on('pgadmin-sqleditor:button:copy_row', self._copy_row, self);
         self.on('pgadmin-sqleditor:button:paste_row', self._paste_row, self);
         self.on('pgadmin-sqleditor:button:limit', self._set_limit, self);
@@ -3264,49 +3250,6 @@ define('tools.querytool', [
         });
       },
 
-      // This function will apply the filter.
-      _apply_filter: function() {
-        var self = this,
-          sql = self.gridView.filter_obj.getValue();
-
-        self.trigger(
-          'pgadmin-sqleditor:loading-icon:show',
-          gettext('Applying the filter...')
-        );
-
-        // Make ajax call to include the filter by selection
-        $.ajax({
-          url: url_for('sqleditor.apply_filter', {
-            'trans_id': self.transId,
-          }),
-          method: 'POST',
-          contentType: 'application/json',
-          data: JSON.stringify(sql),
-        })
-        .done(function(res) {
-          self.trigger('pgadmin-sqleditor:loading-icon:hide');
-          setTimeout(
-            function() {
-              if (res.data.status) {
-                $('#filter').addClass('d-none');
-                $('#editor-panel').removeClass('sql-editor-busy-fetching');
-                // Refresh the sql grid
-                queryToolActions.executeQuery(self);
-              } else {
-                alertify.alert(gettext('Apply Filter Error'), res.data.result);
-              }
-            }, 10
-          );
-        })
-        .fail(function(e) {
-          self.trigger('pgadmin-sqleditor:loading-icon:hide');
-          let msg = httpErrorHandler.handleQueryToolAjaxError(
-            pgAdmin, self, e, '_apply_filter', [], true
-          );
-          alertify.alert(gettext('Apply Filter Error'), msg);
-        });
-      },
-
       // This function will copy the selected row.
       _copy_row: copyData,