From 3fa8b8e1866933fdfccd0598a11e443fc1693840 Mon Sep 17 00:00:00 2001
From: siikamiika <siikamiika@users.noreply.github.com>
Date: Tue, 14 Apr 2020 21:21:52 +0300
Subject: [PATCH] prevent infinite loop if source length is 0

---
 ext/bg/js/backend.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index d5086af2..960c65bf 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -324,7 +324,7 @@ class Backend {
                 {},
                 options
             );
-            if (definitions.length > 0) {
+            if (definitions.length > 0 && sourceLength > 0) {
                 dictTermsSort(definitions);
                 const {expression, reading} = definitions[0];
                 const source = text.substring(0, sourceLength);