diff --git a/service.js b/service.js
index 7ff1c03..71740d0 100644
--- a/service.js
+++ b/service.js
@@ -366,6 +366,7 @@ class BesService {
     const scrollX = scrollPanelRect.left
     const scrollY = scrollPanelRect.top
     match.highlights = Array.from(range.getClientRects())
+    if (match.highlights.length === 0) return
     const dpr = window.devicePixelRatio
     this.ctx.lineWidth = 2 * dpr // Use 2 for clearer visibility
     const ruleId = match.match.rule.id