diff -r 0b04e5689c33 Modules/cjkcodecs/multibytecodec.c
--- a/Modules/cjkcodecs/multibytecodec.c	Wed Jul 15 22:12:33 2015 +0300
+++ b/Modules/cjkcodecs/multibytecodec.c	Thu Jul 16 00:59:54 2015 +0200
@@ -1685,14 +1685,18 @@ static PyObject *
 {
     PyObject *pwrt;
 
-    pwrt = multibytecodec_encode(self->codec, &self->state,
-                    self->pending, NULL, self->errors,
-                    MBENC_FLUSH | MBENC_RESET);
-    /* some pending buffer can be truncated when UnicodeEncodeError is
-     * raised on 'strict' mode. but, 'reset' method is designed to
-     * reset the pending buffer or states so failed string sequence
-     * ought to be missed */
-    Py_CLEAR(self->pending);
+    if (self->pending != NULL) {
+        pwrt = multibytecodec_encode(self->codec, &self->state,
+                        self->pending, NULL, self->errors,
+                        MBENC_FLUSH | MBENC_RESET);
+        /* some pending buffer can be truncated when UnicodeEncodeError is
+         * raised on 'strict' mode. but, 'reset' method is designed to
+         * reset the pending buffer or states so failed string sequence
+         * ought to be missed */
+        Py_CLEAR(self->pending);
+    }
+    else
+        pwrt = PyBytes_FromStringAndSize("", 0);
     if (pwrt == NULL)
         return NULL;