diff --git a/paddle/gserver/evaluators/CTCErrorEvaluator.cpp b/paddle/gserver/evaluators/CTCErrorEvaluator.cpp
index 05aa6c012ae2bc0afcbaf23f8ff78b3c782d050c..132119015f967c6e8d055792de8afe8450df5ec6 100644
--- a/paddle/gserver/evaluators/CTCErrorEvaluator.cpp
+++ b/paddle/gserver/evaluators/CTCErrorEvaluator.cpp
@@ -20,7 +20,7 @@ namespace paddle {
 /**
  * calculate sequence-to-sequence edit distance
  */
-class CTCErrorEvaluator : public Evaluator {
+class CTCErrorEvaluator : public NotGetableEvaluator {
 private:
   MatrixPtr outActivations_;
   int numTimes_, numClasses_, numSequences_, blank_;
diff --git a/paddle/gserver/evaluators/Evaluator.cpp b/paddle/gserver/evaluators/Evaluator.cpp
index 29b5284fe59b5d6e111b33354bb2142078a8fc03..42a877954b6c3ece3f3b728e4af036f367ba37e9 100644
--- a/paddle/gserver/evaluators/Evaluator.cpp
+++ b/paddle/gserver/evaluators/Evaluator.cpp
@@ -823,8 +823,10 @@ real PrecisionRecallEvaluator::getValue(const std::string& name,
   std::vector<std::string> buffers;
   paddle::str::split(name, '.', &buffers);
   auto it = this->values_.find(buffers[buffers.size() - 1]);
-  if (it != this->values_.end() && err != nullptr) {
-    *err = Error("No such key %s", name.c_str());
+  if (it == this->values_.end()) {  // not found
+    if (err != nullptr) {
+      *err = Error("No such key %s", name.c_str());
+    }
     return .0f;
   }
 
diff --git a/paddle/gserver/tests/test_Evaluator.cpp b/paddle/gserver/tests/test_Evaluator.cpp
index 8165eb8269336193858962edac4f9637c2fc1c2f..100cf0780950921ddf060be4193172ead771abae 100644
--- a/paddle/gserver/tests/test_Evaluator.cpp
+++ b/paddle/gserver/tests/test_Evaluator.cpp
@@ -110,6 +110,18 @@ void testEvaluator(TestConfig testConf,
   testEvaluator->finish();
   LOG(INFO) << *testEvaluator;
 
+  std::vector<std::string> names;
+  testEvaluator->getNames(&names);
+  paddle::Error err;
+  for (auto& name : names) {
+    auto value = testEvaluator->getValueStr(name, &err);
+    ASSERT_TRUE(err.isOK());
+    LOG(INFO) << name << " " << value;
+    auto tp = testEvaluator->getType(name, &err);
+    ASSERT_TRUE(err.isOK());
+    ASSERT_EQ(testConf.evaluatorConfig.type(), tp);
+  }
+
   double totalScore2 = 0.0;
   if (testConf.testAccumulate) {
     testEvaluator->start();