diff --git a/honoka/src/honoka_imengine.cpp b/honoka/src/honoka_imengine.cpp
index 4190af1..ea9ef00 100644
--- a/honoka/src/honoka_imengine.cpp
+++ b/honoka/src/honoka_imengine.cpp
@@ -1217,12 +1217,12 @@
                 if (convertors[i] == m_convertor) return true;
                 if (!convertors[i]->isConnected())
                     if (!convertors[i]->connect()) return true;
-                m_no_update = true;
                 WideString y;
                 for(unsigned int j = 0;j < segments.size();j ++) y += segments[j].getYomi();
                 convertors[i]->setYomiText(y);
                 //convertors[i]->setYomiText(m_preeditor->getText(true));
-                convertors[i]->ren_conversion();
+                if (convertors[i]->ren_conversion() <= 0) return true;
+                m_no_update = true;
                 MultiConvertor::aline(m_convertor,convertors[i]);
                 m_convList = convertors[i]->getResultList(m_convertor->getPos());
                 m_convList.Title = utf8_mbstowcs(String("(") + convertors[i]->getPropertyName() + String(")"));
@@ -1505,7 +1505,7 @@
     }
 
     m_convertor->setYomiText(s);
-    if (m_convertor->ren_conversion() == -1) {
+    if (m_convertor->ren_conversion() <= 0) {
         update_aux_string(utf8_mbstowcs(String(_("The error was received from Converter. "))));
         show_aux_string();
         m_convertor = m_def_convertor;
@@ -1547,7 +1547,7 @@
 
     m_convertor->reset();
     m_convertor->setYomiText(m_preeditor->getText(true));
-    if (m_convertor->ren_conversion() == -1) {
+    if (m_convertor->ren_conversion() <= 0) {
         update_aux_string(utf8_mbstowcs(String(_("could not connect to server."))));
         show_aux_string();
         show_preedit_string();