PDataTable overlay fix

Author: dv-hulkapps

package-lock.json

@@ -18,7 +18,7 @@
     "component library"
   ],
   "license": "MIT",
-  "version": "2.1.8",
+  "version": "2.1.9",
   "scripts": {
     "serve": "vue-cli-service serve",
     "build": "vue-cli-service build",

package.json

@@ -257,7 +257,7 @@ export default class PDataTable extends Vue {
 
       let loadingPosition = 0;
 
-      if (typeof window !== 'undefined') {
+      if (typeof window !== 'undefined' && this.$refs.hasOwnProperty('tbody')) {
 
         const overlay = (this.$refs.tbody as Element).getBoundingClientRect();