Fix for SSR

Author: phortx

dist/vuex-orm-graphql.es5.js

@@ -69,13 +69,7 @@ export function graphQlDocumentToString(query: DocumentNode): string {
  */
 export function isPlainObject(obj: any): boolean {
   // Basic check for Type object that's not null
-  if (typeof obj === "object" && obj !== null) {
-    const proto = Object.getPrototypeOf(obj);
-    return proto === Object.prototype || proto === null;
-  }
-
-  // Not an object
-  return false;
+  return obj !== null && typeof obj === "object";
 }
 
 /**

dist/vuex-orm-graphql.es5.js.map

@@ -59,7 +59,9 @@ export default class VuexORMGraphQL {
       bypassCache = false
     ) {
       let filterObj = filter;
-      if (!isPlainObject(filterObj)) filterObj = { id: filter };
+      if (!isPlainObject(filterObj)) {
+        filterObj = { id: filter };
+      }
       return this.dispatch("fetch", { filter: filterObj, bypassCache });
     };