diff --git a/cypress/integration/2_rules.spec.js b/cypress/integration/2_rules.spec.js
index 18b18f6ca..3e90ed212 100644
--- a/cypress/integration/2_rules.spec.js
+++ b/cypress/integration/2_rules.spec.js
@@ -330,13 +330,20 @@ describe('Rules', () => {
     it('...should validate selection map key field', () => {
       getSelectionPanelByIndex(0).within(() => {
         getMapKeyField().should('be.empty');
-        getMapKeyField().focus().blur();
+        getMapKeyField()
+          .focus()
+          .blur()
+          .parents('.euiFormRow__fieldWrapper')
+          .find('.euiFormErrorText')
+          .should('not.exist');
+
+        getMapKeyField().type('hello@');
         getMapKeyField()
           .parentsUntil('.euiFormRow__fieldWrapper')
           .siblings()
           .contains('Invalid key name');
 
-        getMapKeyField().type('FieldKey');
+        getMapKeyField().focus().type('{selectall}').type('FieldKey');
         getMapKeyField()
           .focus()
           .blur()
@@ -446,7 +453,6 @@ describe('Rules', () => {
       getSelectionPanelByIndex(0).within(() =>
         getMapKeyField().type('{selectall}').type('{backspace}')
       );
-      toastShouldExist();
       getSelectionPanelByIndex(0).within(() => getMapKeyField().type('FieldKey'));
 
       // selection map value field
diff --git a/public/pages/Rules/components/RuleEditor/DetectionVisualEditor.tsx b/public/pages/Rules/components/RuleEditor/DetectionVisualEditor.tsx
index bf63b5fa9..84390d5fe 100644
--- a/public/pages/Rules/components/RuleEditor/DetectionVisualEditor.tsx
+++ b/public/pages/Rules/components/RuleEditor/DetectionVisualEditor.tsx
@@ -275,7 +275,7 @@ export class DetectionVisualEditor extends React.Component<
           const fieldName = `field_${selIdx}_${idx}`;
           delete errors.fields[fieldName];
 
-          if (!validateDetectionFieldName(data.field)) {
+          if (data.field && !validateDetectionFieldName(data.field)) {
             errors.fields[fieldName] =
               'Invalid key name. Valid characters are a-z, A-Z, 0-9, hyphens, dots, and underscores';
           }