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-rw-r--r--content_scripts/ui_component.coffee3
1 files changed, 2 insertions, 1 deletions
diff --git a/content_scripts/ui_component.coffee b/content_scripts/ui_component.coffee
index fc40e1ca..77c52d3d 100644
--- a/content_scripts/ui_component.coffee
+++ b/content_scripts/ui_component.coffee
@@ -33,7 +33,8 @@ class UIComponent
@iframeElement.contentWindow.postMessage secret, chrome.runtime.getURL(""), [messageChannel.port2]
postMessage: (message) ->
- @iframePort.postMessage message
+ # We use "?" here because the iframe port is initialized asynchronously, and may not yet be ready.
+ @iframePort?.postMessage message
activate: (@options) ->
@postMessage @options if @options?