diff --git a/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts b/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
index 3e756cae90..1c417991e0 100644
--- a/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
+++ b/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
@@ -256,7 +256,7 @@ export default function(props: {
 			case 'mention': {
 				return [h(MkMention, {
 					key: Math.random(),
-					host: (token.props.host == null && props.author && props.author.host != null ? props.author.host : token.props.host) || host,
+					host: (token.props.host == null && props.author && props.author.host != null ? props.author.host : token.props.host) ?? host,
 					username: token.props.username,
 				})];
 			}