diff --git a/nebtestkit/cases/contract/contract.feature.random.test.js b/nebtestkit/cases/contract/contract.feature.random.test.js
index 7037dca18..4466f52a6 100644
--- a/nebtestkit/cases/contract/contract.feature.random.test.js
+++ b/nebtestkit/cases/contract/contract.feature.random.test.js
@@ -319,10 +319,10 @@ var caseGroup = {
                 }
             },
             "testExpect": {
-                canExcuteTx: true,
+                canExcuteTx: false,
                 toBalanceChange: "0",
-                status: 1,
-                equalr1r2: false
+                status: 0,
+                eventErr: "Call: Error: input seed must be a string"
             }
         },
         {
diff --git a/nf/nvm/module.go b/nf/nvm/module.go
index 909ac52d4..2f3967e9f 100644
--- a/nf/nvm/module.go
+++ b/nf/nvm/module.go
@@ -176,11 +176,6 @@ func AttachLibVersionDelegateFunc(handler unsafe.Pointer, require *C.char) *C.ch
 			return nil
 		}
 
-		logging.VLog().WithFields(logrus.Fields{
-			"libname": libname,
-			"return":  JSLibRootName + ver + libname[JSLibRootNameLen-1:],
-		}).Debug("attach lib.")
-
 		return C.CString(JSLibRootName + ver + libname[JSLibRootNameLen-1:])
 	}
 
@@ -192,11 +187,6 @@ func AttachLibVersionDelegateFunc(handler unsafe.Pointer, require *C.char) *C.ch
 			libname = JSLibRootName + libname
 		}
 	}
-
-	logging.VLog().WithFields(logrus.Fields{
-		"libname": libname,
-		"return":  JSLibRootName + core.DefaultV8JSLibVersion + libname[JSLibRootNameLen-1:],
-	}).Debug("attach lib.")
 	return C.CString(JSLibRootName + core.DefaultV8JSLibVersion + libname[JSLibRootNameLen-1:])
 }
 
diff --git a/nf/nvm/native-lib/libnebulasv8.dylib b/nf/nvm/native-lib/libnebulasv8.dylib
index 0f5976f06..7aba15343 100755
Binary files a/nf/nvm/native-lib/libnebulasv8.dylib and b/nf/nvm/native-lib/libnebulasv8.dylib differ
diff --git a/nf/nvm/v8/lib/1.0.5/random.js b/nf/nvm/v8/lib/1.0.5/random.js
index 75db3c4ac..8bdf1c2a0 100644
--- a/nf/nvm/v8/lib/1.0.5/random.js
+++ b/nf/nvm/v8/lib/1.0.5/random.js
@@ -123,7 +123,7 @@ module.exports = (function(){
         if (typeof(userseed) !== 'string') {
             throw new Error("input seed must be a string")
         }
-        if (typeof userseed === 'undefined' || userseed == null || userseed === "") {
+        if (userseed === "") {
             return;
         }
         checkCtx();