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-rw-r--r--background_scripts/commands.coffee2
1 files changed, 1 insertions, 1 deletions
diff --git a/background_scripts/commands.coffee b/background_scripts/commands.coffee
index 3684304c..aece4bec 100644
--- a/background_scripts/commands.coffee
+++ b/background_scripts/commands.coffee
@@ -39,7 +39,7 @@ Commands =
if tokens.length == 3
fromChar = @parseKeySequence tokens[1]
toChar = @parseKeySequence tokens[2]
- @mapKeyRegistry[fromChar[0]] = toChar[0] if fromChar.length == toChar.length == 1
+ @mapKeyRegistry[fromChar[0]] ?= toChar[0] if fromChar.length == toChar.length == 1
chrome.storage.local.set mapKeyRegistry: @mapKeyRegistry
@installKeyStateMapping()