diff --git a/src-ui/src/app/components/common/custom-fields-query-dropdown/custom-fields-query-dropdown.component.html b/src-ui/src/app/components/common/custom-fields-query-dropdown/custom-fields-query-dropdown.component.html
index 6c46275cc..d2d5ca4c6 100644
--- a/src-ui/src/app/components/common/custom-fields-query-dropdown/custom-fields-query-dropdown.component.html
+++ b/src-ui/src/app/components/common/custom-fields-query-dropdown/custom-fields-query-dropdown.component.html
@@ -108,6 +108,10 @@
         <label class="btn btn-outline-primary" for="logicalOperatorOr_{{expression.id}}" i18n>Any</label>
         <input [(ngModel)]="expression.operator" type="radio" class="btn-check" id="logicalOperatorAnd_{{expression.id}}" name="logicalOperatorAnd_{{expression.id}}" value="AND" [disabled]="expression.value.length < 2">
         <label class="btn btn-outline-primary" for="logicalOperatorAnd_{{expression.id}}" i18n>All</label>
+        @if (expression.negatable)  {
+          <input [(ngModel)]="expression.operator" type="radio" class="btn-check" id="logicalOperatorNot_{{expression.id}}" name="logicalOperatorNot_{{expression.id}}" value="NOT">
+          <label class="btn btn-outline-warning" for="logicalOperatorNot_{{expression.id}}" i18n>Not</label>
+        }
       </div>
       <div class="list-group list-group-flush mb-n2">
         @for (element of expression.value; track element.id; let i = $index) {
diff --git a/src-ui/src/app/data/custom-field-query.ts b/src-ui/src/app/data/custom-field-query.ts
index ab801d85e..70fc4f374 100644
--- a/src-ui/src/app/data/custom-field-query.ts
+++ b/src-ui/src/app/data/custom-field-query.ts
@@ -268,8 +268,6 @@ export class CustomFieldQueryExpression extends CustomFieldQueryElement {
     super(CustomFieldQueryElementType.Expression)
     let values
     ;[this._operator, values] = expressionArray
-    console.log(values)
-
     if (!values || values.length === 0) {
       this._value = []
     } else if (values?.length > 0 && values[0] instanceof Array) {
@@ -291,7 +289,12 @@ export class CustomFieldQueryExpression extends CustomFieldQueryElement {
         }
       })
     } else {
-      this._value = [new CustomFieldQueryExpression(values as any)]
+      const expression = new CustomFieldQueryExpression(values as any)
+      expression.depth = this.depth + 1
+      expression.changed.subscribe(() => {
+        this.changed.next(this)
+      })
+      this._value = [expression]
     }
   }
 
@@ -299,6 +302,13 @@ export class CustomFieldQueryExpression extends CustomFieldQueryElement {
     let value
     if (this._value instanceof Array) {
       value = this._value.map((atom) => atom.serialize())
+      // If the expression is negated it should have only one child which is an expression
+      if (
+        this._operator === CustomFieldQueryLogicalOperator.Not &&
+        value.length === 1
+      ) {
+        value = value[0]
+      }
     } else {
       value = value.serialize()
     }
@@ -328,4 +338,12 @@ export class CustomFieldQueryExpression extends CustomFieldQueryElement {
       this.changed.next(this)
     })
   }
+
+  public get negatable(): boolean {
+    return (
+      this.value.length === 1 &&
+      (this.value[0] as CustomFieldQueryElement).type ===
+        CustomFieldQueryElementType.Expression
+    )
+  }
 }