diff --git a/src/client/ui/font.ts b/src/client/ui/font.ts
index 2b32e33..50fbd73 100644
--- a/src/client/ui/font.ts
+++ b/src/client/ui/font.ts
@@ -113,6 +113,9 @@ export function parseFontTblMetrics(tblBytes: Uint8Array): {
  * Split a string containing Diablo II `ÿcX` color codes into colored spans.
  */
 export function parseColoredText(input: string, defaultColor: D2ColorCode = 'white'): TextSpan[] {
+  if (!input || typeof input !== 'string') {
+    return []
+  }
   const spans: TextSpan[] = []
   let currentColor: D2ColorCode = defaultColor
   let buf = ''