diff --git a/packages/frontend/editor-ui/src/features/ndv/shared/ndv.utils.test.ts b/packages/frontend/editor-ui/src/features/ndv/shared/ndv.utils.test.ts
index d30f7159462..958cea3b719 100644
--- a/packages/frontend/editor-ui/src/features/ndv/shared/ndv.utils.test.ts
+++ b/packages/frontend/editor-ui/src/features/ndv/shared/ndv.utils.test.ts
@@ -399,6 +399,15 @@ describe('parseFromExpression', () => {
 		expect(parseFromExpression(true, undefined, 'boolean', false, [])).toBe(false);
 	});
 
+	it('returns defaultValue for number/boolean when expression resolves to null', () => {
+		// Unresolvable $fromAI() expressions resolve to null in the editor; falling back to
+		// the default (instead of null) is what lets the Fixed tab clear the expression.
+		expect(
+			parseFromExpression('={{ $fromAI("x", "", "boolean") }}', null, 'boolean', false, []),
+		).toBe(false);
+		expect(parseFromExpression('={{ $fromAI("x", "", "number") }}', null, 'number', 0, [])).toBe(0);
+	});
+
 	it('returns null for other types if value is undefined', () => {
 		expect(parseFromExpression({}, undefined, 'json', null, [])).toBeNull();
 	});
diff --git a/packages/frontend/editor-ui/src/features/ndv/shared/ndv.utils.ts b/packages/frontend/editor-ui/src/features/ndv/shared/ndv.utils.ts
index 7a5e8f5a497..6b24d9e8926 100644
--- a/packages/frontend/editor-ui/src/features/ndv/shared/ndv.utils.ts
+++ b/packages/frontend/editor-ui/src/features/ndv/shared/ndv.utils.ts
@@ -432,12 +432,13 @@ export function parseFromExpression(
 		return currentParameterValue ? currentParameterValue.replace(/^=+/, '') : null;
 	}
 
-	if (typeof evaluatedExpressionValue !== 'undefined') {
-		return evaluatedExpressionValue;
+	// Fall back to default when the expression can't resolve (e.g. $fromAI() -> null); `??` keeps a real `false`/`0`.
+	if (['number', 'boolean'].includes(parameterType)) {
+		return evaluatedExpressionValue ?? defaultValue;
 	}
 
-	if (['number', 'boolean'].includes(parameterType)) {
-		return defaultValue;
+	if (typeof evaluatedExpressionValue !== 'undefined') {
+		return evaluatedExpressionValue;
 	}
 
 	return null;