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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 490234b4a..ca65176d9 100644
--- a/program/js/app.js
+++ b/program/js/app.js
@@ -1451,7 +1451,7 @@ function rcube_webmail()
this.is_framed = function()
{
- return (this.env.framed && parent.rcmail && parent.rcmail != this && parent.rcmail.command);
+ return this.env.framed && parent.rcmail && parent.rcmail != this && typeof parent.rcmail.command == 'function';
};
this.save_pref = function(prop)