diff --git a/src/muya/lib/contentState/tabCtrl.js b/src/muya/lib/contentState/tabCtrl.js
index 4a2e6790..c2a14bf3 100644
--- a/src/muya/lib/contentState/tabCtrl.js
+++ b/src/muya/lib/contentState/tabCtrl.js
@@ -302,6 +302,11 @@ const tabCtrl = ContentState => {
     // disable tab focus
     event.preventDefault()
 
+    // skip subsequent processing if IME is working
+    if (event.isComposing) {
+      return
+    }
+
     const { start, end } = selection.getCursorRange()
     if (!start || !end) {
       return