diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java
index 1cf024f30e..777eef53d1 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java
@@ -158,9 +158,9 @@ public class TSDBStatement implements Statement {
             throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
         } else if (resultSetPointer == TSDBConstants.JNI_NULL_POINTER) {
             // no result set is retrieved
+			this.connecter.freeResultSet(pSql);
             res = false;
         }
-		this.connecter.freeResultSet(pSql);
 
 		return res;
 	}
diff --git a/src/connector/jdbc/src/test/java/TestAsyncTSDBSubscribe.java b/src/connector/jdbc/src/test/java/TestAsyncTSDBSubscribe.java
index 03a4761b91..6d4c6b1e94 100644
--- a/src/connector/jdbc/src/test/java/TestAsyncTSDBSubscribe.java
+++ b/src/connector/jdbc/src/test/java/TestAsyncTSDBSubscribe.java
@@ -42,12 +42,14 @@ public class TestAsyncTSDBSubscribe {
         long subscribId = 0;
         try {
             Class.forName("com.taosdata.jdbc.TSDBDriver");
+
             Properties properties = new Properties();
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+
             connection = DriverManager.getConnection("jdbc:TAOS://" + host + ":0/" + dbName + "?user=root&password=taosdata", properties);
             String rawSql = "select * from " + tName + ";";
             TSDBSubscribe subscribe = ((TSDBConnection) connection).createSubscribe();
diff --git a/src/query/src/qFill.c b/src/query/src/qFill.c
index ac44feb576..d28d99ceb8 100644
--- a/src/query/src/qFill.c
+++ b/src/query/src/qFill.c
@@ -131,7 +131,7 @@ void taosFillCopyInputDataFromOneFilePage(SFillInfo* pFillInfo, tFilePage* pInpu
   assert(pFillInfo->numOfRows == pInput->num);
   int32_t t = 0;
   
-  for(int32_t i = 0; i < pFillInfo->numOfCols; ++i) {
+  for(int32_t i = 0; i < pFillInfo->numOfCols && t < pFillInfo->numOfTags; ++i) {
     SFillColInfo* pCol = &pFillInfo->pFillCol[i];
     
     char* s = pInput->data + pCol->col.offset * pInput->num;
diff --git a/tests/script/general/parser/lastrow_query.sim b/tests/script/general/parser/lastrow_query.sim
index 72e8b4de95..9f52e45b80 100644
--- a/tests/script/general/parser/lastrow_query.sim
+++ b/tests/script/general/parser/lastrow_query.sim
@@ -51,7 +51,14 @@ if $data09 != NCHAR then
   return -1
 endi
 
+# regression test case 1
 sql select count(*) from lr_tb1 where ts>'2018-09-18 08:45:00.1' and ts<'2018-09-18 08:45:00.2'
 if $row != 0 then
   return -1
 endi
+
+# regression test case 2
+sql select count(*) from lr_db0.lr_stb0 where ts>'2018-9-18 8:00:00' and ts<'2018-9-18 14:00:00' interval(1s) fill(NULL);
+if $row != 21600 then
+  return -1
+endi
\ No newline at end of file