diff --git a/packages/core/src/util/stringify.ts b/packages/core/src/util/stringify.ts
index 6545d9ee566..916ddeaeb49 100644
--- a/packages/core/src/util/stringify.ts
+++ b/packages/core/src/util/stringify.ts
@@ -46,13 +46,9 @@ export function stringify(token: any): string {
  * @returns concatenated string.
  */
 export function concatStringsWithSpace(before: string | null, after: string | null): string {
-  return before == null || before === ''
-    ? after === null
-      ? ''
-      : after
-    : after == null || after === ''
-      ? before
-      : before + ' ' + after;
+  if (!before) return after || '';
+  if (!after) return before;
+  return `${before} ${after}`;
 }
 
 /**