diff --git a/dist/interfaces/filter.d.ts b/dist/interfaces/filter.d.ts
index 6c9e86c..6e8ab4c 100644
--- a/dist/interfaces/filter.d.ts
+++ b/dist/interfaces/filter.d.ts
@@ -12,7 +12,7 @@ export interface ComparisonFilter<Value> {
     readonly $search?: Value;
 }
 export declare type ItemFilter<I extends Item> = {
-    readonly [P in keyof I]?: I[P] | ComparisonFilter<I[P]>;
+    readonly [P in keyof I]?: I[P] | ComparisonFilter<null | I[P]>;
 };
 export interface LogicalFilter<I extends Item> {
     readonly $and?: Filter<I>[];
diff --git a/src/interfaces/Filter.ts b/src/interfaces/Filter.ts
index 6a0726e..9d19426 100644
--- a/src/interfaces/Filter.ts
+++ b/src/interfaces/Filter.ts
@@ -14,7 +14,7 @@ export interface ComparisonFilter<Value> {
 }
 
 export type ItemFilter<I extends Item> = {
-  readonly [P in keyof I]?: I[P] | ComparisonFilter<I[P]>;
+  readonly [P in keyof I]?: I[P] | ComparisonFilter<null | I[P]>;
 };
 
 export interface LogicalFilter<I extends Item> {