diff --git a/webapp/metviewer/js/metviewer_common.js b/webapp/metviewer/js/metviewer_common.js
index 69a8bfe4..451887ed 100644
--- a/webapp/metviewer/js/metviewer_common.js
+++ b/webapp/metviewer/js/metviewer_common.js
@@ -6245,8 +6245,13 @@ function requestDBUpdate() {
         },
         success: function (data) {
             categories = $(data).find("groups").find('group');
+            try {
+                $('#listdt').jqGrid('GridUnload');
+            }
+            catch(err) {
+
+            }
 
-            $('#listdt').jqGrid('GridUnload');
             initPage();
         }
     });
diff --git a/webapp/metviewer/js/metviewer_common.min.js b/webapp/metviewer/js/metviewer_common.min.js
index a8564b02..d8ce74d3 100644
--- a/webapp/metviewer/js/metviewer_common.min.js
+++ b/webapp/metviewer/js/metviewer_common.min.js
@@ -282,7 +282,7 @@ b=[];var d=$(a[0]).attr("name");try{$("#fcst_var_y1_1").val(d).multiselect("refr
 $("#txtPlotCond").val(initXML.find("plot").find("plot_cond").text());d=$(initXML.find("plot").find("indep")[0]).attr("name");try{$("#indy_var").val(d).multiselect("refresh")}catch(f){}"fcst_init_beg"==d||"fcst_valid_beg"==d||"fcst_valid"==d||"fcst_init"==d?$("#date_period_button").css("display","block"):$("#date_period_button").css("display","none");var c=[];indy_var_vals_to_attr={};$(initXML.find("plot").find("indep")[0]).find("val").each(function(){c.push($(this).text());var a={};a.label=$(this)[0].attributes.label.nodeValue;
 a.plot_val=$(this)[0].attributes.plot_val.nodeValue;indy_var_vals_to_attr[$(this).text()]=a});0<c.length&&($("#indy_var_val").multiselect("option","indy_var_vals_to_attr",indy_var_vals_to_attr),populateIndyVarVal(c));loadXMLStatistics(b);d=$(initXML.find("plot").find("tmpl").find("listDiffSeries1")).text();0===d.length&&(d="list()");if("list()"!==d)for(d=d.split("c("),a=1;a<d.length;a++)d[a]=d[a].replace(/\(/g,"").replace(/\)/g,"").replace(/"/g,""),seriesDiffY1.push(d[a]);try{$("#contour_intervals").val(initXML.find("plot").find("contour_intervals").text())}catch(f){}try{$("#color_palette").val(initXML.find("plot").find("color_palette").text())}catch(f){}try{$("#add_color_bar").prop("checked",
 "true"==$(initXML.find("plot").find("add_color_bar")).text())}catch(f){}try{$("#reverse_y").prop("checked","true"==$(initXML.find("plot").find("reverse_y")).text())}catch(f){}try{$("#reverse_x").prop("checked","true"==$(initXML.find("plot").find("reverse_x")).text())}catch(f){}try{$("#add_contour_overlay").prop("checked","true"==$(initXML.find("plot").find("add_contour_overlay")).text())}catch(f){}updateSeries()}
-function requestDBUpdate(){$.ajax({async:!1,url:"servlet",type:"POST",dataType:"xml",processData:!1,contentType:"application/xml",data:'<?xml version="1.0" encoding="UTF-8"?><request><list_db_update></list_db_update></request>',error:function(a,b,d){},success:function(a){categories=$(a).find("groups").find("group");$("#listdt").jqGrid("GridUnload");initPage()}})}
+function requestDBUpdate(){$.ajax({async:!1,url:"servlet",type:"POST",dataType:"xml",processData:!1,contentType:"application/xml",data:'<?xml version="1.0" encoding="UTF-8"?><request><list_db_update></list_db_update></request>',error:function(a,b,d){},success:function(a){categories=$(a).find("groups").find("group");try{$("#listdt").jqGrid("GridUnload")}catch(b){}initPage()}})}
 function updateFixVar(a){for(var b=fixed_var_indexes.slice(),d=0;d<b.length;d++)removeFixedVar("fixed_var_"+b[d]);var e=$(".remove_fixed_var").prop("id").split("remove_fixed_var_")[1];try{$("#fixed_var_val_"+e).multiselect("uncheckAll"),$("#fixed_var_val_"+e).multiselect("refresh")}catch(c){}fixed_var_indexes.push(parseInt(e));$("#fixed_var_"+e).empty();"stat"==a?$.each(fix_var_value_to_title_stat_map,function(a,b){$("#fixed_var_"+e).append('<option value="'+a+'">'+b+"</option>")}):$.each(fix_var_value_to_title_mode_map,
 function(a,b){$("#fixed_var_"+e).append('<option value="'+a+'">'+b+"</option>")});try{$("#fixed_var_"+e).multiselect("uncheckAll"),$("#fixed_var_"+e).multiselect("refresh")}catch(c){}}
 function updateIndyVar(a){$("#indy_var").empty();"stat"==a?$.each(indy_var_value_to_title_stat_map,function(a,d){$("#indy_var").append('<option value="'+a+'">'+d+"</option>")}):$.each(indy_var_value_to_title_mode_map,function(a,d){$("#indy_var").append('<option value="'+a+'">'+d+"</option>")});try{$("#indy_var").multiselect("refresh")}catch(b){}$("#date_period").css("display","none")}String.prototype.endsWith=function(a){return-1!==this.indexOf(a,this.length-a.length)};