diff --git a/internal/lsp/search/semantic.go b/internal/lsp/search/semantic.go
index 3f12f800..8156c0eb 100644
--- a/internal/lsp/search/semantic.go
+++ b/internal/lsp/search/semantic.go
@@ -31,7 +31,7 @@ func (b *tokenBuilder) append(r core.Range, token int) {
 	}
 
 	l := r.End.Character - r.Start.Character
-	if l <= 0 {
+	if l < 0 { // 可能存在长度为 0 的，比如 default="" 值的长度为 0
 		panic(fmt.Sprintf("无效的参数 range，其长度为 %d", l))
 	}
 
diff --git a/internal/lsp/search/semantic_test.go b/internal/lsp/search/semantic_test.go
index 4e2099c8..5444136a 100644
--- a/internal/lsp/search/semantic_test.go
+++ b/internal/lsp/search/semantic_test.go
@@ -27,12 +27,11 @@ func TestTokenBuilder_append(t *testing.T) {
 	a.Equal(1, len(b.tokens))
 
 	// 长度为 0
-	a.Panic(func() {
-		b.append(core.Range{
-			Start: core.Position{Line: 1, Character: 11},
-			End:   core.Position{Line: 1, Character: 11},
-		}, 1)
-	})
+	b.append(core.Range{
+		Start: core.Position{Line: 1, Character: 11},
+		End:   core.Position{Line: 1, Character: 11},
+	}, 1)
+	a.Equal(2, len(b.tokens))
 
 	// 长度为负数
 	a.Panic(func() {