diff --git a/adminforth/modules/operationalResource.ts b/adminforth/modules/operationalResource.ts
index 1a98938c..02f0a832 100644
--- a/adminforth/modules/operationalResource.ts
+++ b/adminforth/modules/operationalResource.ts
@@ -5,7 +5,19 @@ function filtersIfFilter(filter: IAdminForthFilter | IAdminForthFilter[] | undef
   if (!filter) {
     return [];
   }
-  return (Array.isArray(filter) ? filter : [filter]) as IAdminForthFilter[];
+  const ret = (Array.isArray(filter) ? filter : [filter]) as IAdminForthFilter[];
+
+  ret.forEach((f) => {
+    if (typeof f !== 'object') {
+      throw new Error('Filter must be an object');
+    }
+    if (!f._adminforth) {
+      throw new Error('Filter must be Filters.X() or Filters.NOT() or Filters.OR() or Filters.AND()');
+    }
+    
+  });
+
+  return ret;
 }
 
 function sortsIfSort(sort: IAdminForthSort | IAdminForthSort[]): IAdminForthSort[] {
diff --git a/adminforth/types/Back.ts b/adminforth/types/Back.ts
index a636cc0a..2c84299f 100644
--- a/adminforth/types/Back.ts
+++ b/adminforth/types/Back.ts
@@ -110,6 +110,7 @@ export interface IAdminForthFilter {
   field: string;
   operator: AdminForthFilterOperators;
   value: any;
+  _adminforth?: boolean;
 }
 
 export interface IAdminForthSort {
@@ -1043,13 +1044,13 @@ export type FDataFilter = (field: string, value: any) => IAdminForthFilter;
 
 export class Filters {
   static EQ(field: string, value: any): IAdminForthFilter {
-    return { field, operator: AdminForthFilterOperators.EQ, value };
+    return { field, operator: AdminForthFilterOperators.EQ, value, _adminforth: true };
   }
   static NEQ(field: string, value: any): IAdminForthFilter {
-    return { field, operator: AdminForthFilterOperators.NE, value };
+    return { field, operator: AdminForthFilterOperators.NE, value, _adminforth: true };
   }
   static GT(field: string, value: any): IAdminForthFilter {
-    return { field, operator: AdminForthFilterOperators.GT, value };
+    return { field, operator: AdminForthFilterOperators.GT, value, _adminforth: true };
   }
   static GTE(field: string, value: any): IAdminForthFilter {
     return { field, operator: AdminForthFilterOperators.GTE, value };