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-rw-r--r--program/js/app.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/program/js/app.js b/program/js/app.js
index c440d169e..487d718e3 100644
--- a/program/js/app.js
+++ b/program/js/app.js
@@ -3812,7 +3812,7 @@ function rcube_webmail()
for (i=0; i<threads; i++) {
source = this.ksearch_data.sources.shift();
- if (threads > 1 && source === null)
+ if (threads > 1 && source === undefined)
break;
post_data._source = source ? source : '';