diff --git a/src/Common.js b/src/Common.js
index d1fe941..12848f9 100644
--- a/src/Common.js
+++ b/src/Common.js
@@ -216,7 +216,9 @@ export class HighlightedMarkdown extends Component {
                 );
               } catch (e) {}
             } else {
-              let search_kws = props.search_param.split(/[\s()+-]+/);
+              let search_kws = props.search_param
+                .split(/[\s()+-]+/)
+                .filter((s) => s);
               if (search_kws.length) {
                 search_re = new RegExp(
                   `(${search_kws