diff --git a/CMakeLists.txt b/CMakeLists.txt
index 398a7c9..459b8d2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,7 @@ set(CMAKE_VERBOSE_MAKEFILE off)
 # version
 set(TARS_VERSION "1.1.0")
 set(PARSER_VERSION "${TARS_VERSION}")
-set(GENERATOR_VERSION "20190509")
+set(GENERATOR_VERSION "20190510")
 
 # namespace
 set(IDL_NAMESPACE Tars)
diff --git a/build/tars2node b/build/tars2node
index 7fa3bb5..dfa0af0 100755
Binary files a/build/tars2node and b/build/tars2node differ
diff --git a/src/idl_util.cpp b/src/idl_util.cpp
index 4d101d5..4aaa033 100644
--- a/src/idl_util.cpp
+++ b/src/idl_util.cpp
@@ -180,10 +180,16 @@ string CodeGenerator::getDataType(const TypePtr& pPtr, const bool &bCastEnumAsAn
     MapPtr mPtr = MapPtr::dynamicCast(pPtr);
     if (mPtr)
     {
+        string sLeft = representArgument(mPtr->getLeftTypePtr());
+        string sRight = representArgument(mPtr->getRightTypePtr());
+
+        if (sLeft.empty() && !sRight.empty())
+        {
+            sLeft = ", 0";
+        }
+
         return IDL_NAMESPACE_STR + "Stream.Map(" + getDataType(mPtr->getLeftTypePtr(), bCastEnumAsAny) + ", " +
-                getDataType(mPtr->getRightTypePtr(), bCastEnumAsAny) +
-                representArgument(mPtr->getLeftTypePtr()) +
-                representArgument(mPtr->getRightTypePtr()) + ")";
+                getDataType(mPtr->getRightTypePtr(), bCastEnumAsAny) + sLeft + sRight + ")";
     }
 
     EnumPtr ePtr = EnumPtr::dynamicCast(pPtr);