diff --git a/clientSSE.go.tmpl b/clientSSE.go.tmpl
index 8c87cab..523b9f5 100644
--- a/clientSSE.go.tmpl
+++ b/clientSSE.go.tmpl
@@ -76,7 +76,7 @@ const sseResponse = async (
         let lines = buffer.split("\n");
         for (let i = 0; i < lines.length - 1; i++) {
             const line = lines[i];
-            if (line?.length === 0) {
+            if (!line || line.length === 0) {
                 continue;
             }
             let data: any;