convert_error_code_to_mysql(): Do not call thd_mark_transaction_to_rollback()

when thd is NULL.

handler/ha_innodb.cc

@@ -600,7 +600,9 @@ convert_error_code_to_mysql(
 		tell it also to MySQL so that MySQL knows to empty the
 		cached binlog for this transaction */
 
+		if (thd) {
 			thd_mark_transaction_to_rollback(thd, TRUE);
+		}
 
 		return(HA_ERR_LOCK_DEADLOCK);
 	} else if (error == (int) DB_LOCK_WAIT_TIMEOUT) {
@@ -609,8 +611,10 @@ convert_error_code_to_mysql(
 		latest SQL statement in a lock wait timeout. Previously, we
 		rolled back the whole transaction. */
 
-                thd_mark_transaction_to_rollback(thd,
-                                             (bool)row_rollback_on_timeout);
+		if (thd) {
+			thd_mark_transaction_to_rollback(
+				thd, (bool)row_rollback_on_timeout);
+		}
 
 		return(HA_ERR_LOCK_WAIT_TIMEOUT);
 
@@ -662,7 +666,9 @@ convert_error_code_to_mysql(
  		tell it also to MySQL so that MySQL knows to empty the
  		cached binlog for this transaction */
 
+		if (thd) {
 			thd_mark_transaction_to_rollback(thd, TRUE);
+		}
 
     		return(HA_ERR_LOCK_TABLE_FULL);
 	} else if (error == DB_TOO_MANY_CONCURRENT_TRXS) {