diff --git a/source/shared/core_stmt.cpp b/source/shared/core_stmt.cpp
index 6cf50d498..29511a822 100644
--- a/source/shared/core_stmt.cpp
+++ b/source/shared/core_stmt.cpp
@@ -395,6 +395,13 @@ void core_sqlsrv_bind_param( _Inout_ sqlsrv_stmt* stmt, _In_ SQLUSMALLINT param_
             stmt->params_container.insert_param(param_num, new_param);
             param_ptr = new_param;
             new_param.transferred();
+        } else if (direction == SQL_PARAM_INPUT 
+                && param_ptr->sql_data_type != SQL_SS_TABLE
+                && param_ptr->strlen_or_indptr == SQL_NULL_DATA) {
+            // reset the followings for regular input parameters if it was bound as a null param before
+            param_ptr->sql_data_type = sql_type;
+            param_ptr->column_size = column_size;
+            param_ptr->strlen_or_indptr = 0;
         }
 
         SQLSRV_ASSERT(param_ptr != NULL, "core_sqlsrv_bind_param: param_ptr is null. Something went wrong.");
diff --git a/source/sqlsrv/stmt.cpp b/source/sqlsrv/stmt.cpp
index 609209c32..100273fa3 100644
--- a/source/sqlsrv/stmt.cpp
+++ b/source/sqlsrv/stmt.cpp
@@ -1187,8 +1187,6 @@ void bind_params( _Inout_ ss_sqlsrv_stmt* stmt )
 
     try {
 
-        stmt->free_param_data();
-
         stmt->executed = false;
 
         zval* params_z = stmt->params_z;
@@ -1265,6 +1263,8 @@ void bind_params( _Inout_ ss_sqlsrv_stmt* stmt )
         } ZEND_HASH_FOREACH_END();
     }
     catch( core::CoreException& ) {
+        stmt->free_param_data();
+
         SQLFreeStmt( stmt->handle(), SQL_RESET_PARAMS );
         zval_ptr_dtor( stmt->params_z );
         sqlsrv_free( stmt->params_z );
diff --git a/test/functional/pdo_sqlsrv/pdo_1329_string_truncation.phpt b/test/functional/pdo_sqlsrv/pdo_1329_string_truncation.phpt
new file mode 100644
index 000000000..7b1faf291
--- /dev/null
+++ b/test/functional/pdo_sqlsrv/pdo_1329_string_truncation.phpt
@@ -0,0 +1,118 @@
+--TEST--
+GitHub issue 1329 - string truncation error when binding some parameters as non-nulls the second time
+--DESCRIPTION--
+The test shows the same parameters, though bound as nulls in the first insertion, can be bound as non-nulls in the subsequent insertions.
+--ENV--
+PHPT_EXEC=true
+--SKIPIF--
+<?php require('skipif.inc'); ?>
+--FILE--
+<?php
+
+require_once("MsSetup.inc");
+
+function dropTable($conn, $tableName)
+{
+    $drop = "IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'" . $tableName . "') AND type in (N'U')) DROP TABLE $tableName";
+    $conn->exec($drop);
+}
+
+try {
+    $conn = new PDO("sqlsrv:server=$server; Database = $databaseName;", $uid, $pwd);
+    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+    dropTable($conn, 'domains');
+
+$tsql = <<<CREATESQL
+CREATE TABLE domains (
+     id bigint IDENTITY(1,1) NOT NULL,
+     authority nvarchar(255) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
+     base_url_redirect nvarchar(255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
+     regular_not_found_redirect nvarchar(255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
+     invalid_short_url_redirect nvarchar(255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
+     CONSTRAINT PK__domains__3213E83F512B36BA PRIMARY KEY (id))
+CREATESQL;
+
+    $conn->exec($tsql);
+
+$tsql = <<<INSERTSQL
+INSERT INTO domains (authority, base_url_redirect, regular_not_found_redirect, invalid_short_url_redirect) VALUES (?, ?, ?, ?)
+INSERTSQL;
+
+    $stmt = $conn->prepare($tsql);
+    $authority = 'foo.com';
+    $base = null;
+    $notFound = null;
+    $invalid = null;
+    $stmt->bindParam(1, $authority);
+    $stmt->bindParam(2, $base);
+    $stmt->bindParam(3, $notFound);
+    $stmt->bindParam(4, $invalid);
+    $stmt->execute();
+
+    $authority = 'detached-with-ředirects.com';
+    $base = 'fŏő.com';
+    $notFound = 'baŗ.com';
+    $invalid = null;
+    $stmt->bindParam(1, $authority);
+    $stmt->bindParam(2, $base);
+    $stmt->bindParam(3, $notFound);
+    $stmt->bindParam(4, $invalid);
+    $stmt->execute();
+    
+    $authority = 'Őther-redirects.com';
+    $base = 'fooš.com';
+    $notFound = null;
+    $invalid = 'ŷëå';
+    $stmt->bindParam(1, $authority);
+    $stmt->bindParam(2, $base);
+    $stmt->bindParam(3, $notFound);
+    $stmt->bindParam(4, $invalid);
+    $stmt->execute();
+
+    // fetch the data
+    $stmt = $conn->prepare("SELECT * FROM domains");
+    $stmt->execute();
+    $row = $stmt->fetchAll(PDO::FETCH_NUM);
+    print_r($row);
+    
+    dropTable($conn, 'domains');
+
+    echo "Done\n";
+} catch (PdoException $e) {
+    echo $e->getMessage();
+}
+
+?>
+--EXPECT--
+Array
+(
+    [0] => Array
+        (
+            [0] => 1
+            [1] => foo.com
+            [2] => 
+            [3] => 
+            [4] => 
+        )
+
+    [1] => Array
+        (
+            [0] => 2
+            [1] => detached-with-ředirects.com
+            [2] => fŏő.com
+            [3] => baŗ.com
+            [4] => 
+        )
+
+    [2] => Array
+        (
+            [0] => 3
+            [1] => Őther-redirects.com
+            [2] => fooš.com
+            [3] => 
+            [4] => ŷëå
+        )
+
+)
+Done
diff --git a/test/functional/sqlsrv/srv_1329_string_truncation.phpt b/test/functional/sqlsrv/srv_1329_string_truncation.phpt
new file mode 100644
index 000000000..1395c92f8
--- /dev/null
+++ b/test/functional/sqlsrv/srv_1329_string_truncation.phpt
@@ -0,0 +1,112 @@
+--TEST--
+GitHub issue 1329 - string truncation error when binding some parameters as non-nulls the second time
+--DESCRIPTION--
+The test shows the same parameters, though bound as nulls in the first insertion, can be bound as non-nulls in the subsequent insertions.
+--ENV--
+PHPT_EXEC=true
+--SKIPIF--
+<?php require('skipif_versions_old.inc'); ?>
+--FILE--
+<?php
+require_once('MsCommon.inc');
+
+$connectionInfo = array('CharacterSet'=>'UTF-8');
+$conn = AE\connect($connectionInfo);
+
+dropTable($conn, 'srv_domains');
+
+$tsql = <<<CREATESQL
+CREATE TABLE srv_domains (
+     id bigint IDENTITY(1,1) NOT NULL,
+     authority nvarchar(255) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
+     base_url_redirect nvarchar(255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
+     regular_not_found_redirect nvarchar(255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
+     invalid_short_url_redirect nvarchar(255) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
+     CONSTRAINT PK__srv_domains__3213E83F512B36BA PRIMARY KEY (id))
+CREATESQL;
+
+$stmt = sqlsrv_query($conn, $tsql);
+if (!$stmt) {
+    fatalError("failed to create test table");
+}
+
+$tsql = <<<INSERTSQL
+INSERT INTO srv_domains (authority, base_url_redirect, regular_not_found_redirect, invalid_short_url_redirect) VALUES (?, ?, ?, ?)
+INSERTSQL;
+
+$authority = 'foo.com';
+$base = null;
+$notFound = null;
+$invalid = null;
+$params = [&$authority, &$base, &$notFound, &$invalid];
+$stmt = sqlsrv_prepare($conn, $tsql, $params);
+if (!$stmt) {
+    fatalError("failed to prepare the insert statement");
+}
+$result = sqlsrv_execute($stmt);
+if (!$result) {
+    fatalError("failed to execute the insert statement (1)");
+}
+
+$authority = 'detached-with-ředirects.com';
+$base = 'fŏő.com';
+$notFound = 'baŗ.com';
+$invalid = null;
+$result = sqlsrv_execute($stmt);
+if (!$result) {
+    fatalError("failed to execute the insert statement (2)");
+}
+
+$authority = 'Őther-redirects.com';
+$base = 'fooš.com';
+$notFound = null;
+$invalid = 'ŷëå';
+$result = sqlsrv_execute($stmt);
+if (!$result) {
+    fatalError("failed to execute the insert statement (3)");
+}
+
+// fetch the data
+$tsql = "SELECT * FROM srv_domains";
+$stmt = sqlsrv_query($conn, $tsql);
+if (!$stmt) {
+    fatalError("failed to run select query");
+}
+while ($row = sqlsrv_fetch_array( $stmt, SQLSRV_FETCH_NUMERIC)) {
+    print_r($row);
+}
+
+dropTable($conn, 'srv_domains');
+
+sqlsrv_free_stmt($stmt);
+sqlsrv_close($conn);
+
+echo "Done\n";
+
+?>
+--EXPECT--
+Array
+(
+    [0] => 1
+    [1] => foo.com
+    [2] => 
+    [3] => 
+    [4] => 
+)
+Array
+(
+    [0] => 2
+    [1] => detached-with-ředirects.com
+    [2] => fŏő.com
+    [3] => baŗ.com
+    [4] => 
+)
+Array
+(
+    [0] => 3
+    [1] => Őther-redirects.com
+    [2] => fooš.com
+    [3] => 
+    [4] => ŷëå
+)
+Done