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The problem is introduced by WL#4435 "Support OUT-parameters in prepared statements". When a statement that has out parameters was reprepared, the reprepare request error was ignored, and an attempt to send out parameters to the client was made. Since the out parameter list was not initialized in case of an error, this attempt led to a crash. Don't try to send out parameters to the client if an error occurred in statement execution. sql/sql_prepare.cc: Don't try to send out parameters if error. tests/mysql_client_test.c: Re-enable the test case for Bug#49972.