corrupted double-linked list

[ForestPoem]

Continue to press and release the button.

Then, an error occurs.

*** Error in `./BCU': corrupted double-linked list: 0x00e95f48 ***

source code.

connect(ui->pushButton_6,SIGNAL(clicked()),this,SLOT(slot_chk6()));

void DOTest::slot_chk6(){
if(A[5]==0){
ui->pushButton_6->setText("True");
ui->pushButton_6->setStyleSheet(QString::fromUtf8("background-color: rgb(255, 255, 127);"));
A[5]=1;
GET_BCUData->SetShmData(72,true);
}
else if(A[5]==1){
ui->pushButton_6->setText("False");
ui->pushButton_6->setStyleSheet(QString::fromUtf8("background-color: rgb(0, 170, 255);"));
A[5]=0;
GET_BCUData->SetShmData(72,false);
}

}

void SetShmData(int index, float value) {
Shm->SetData(value, index);
}

DataDef *Shm;

void SetData(float value, int index) {
m_data[index] = value;
}

float m_data[256];

[ForestPoem]

pushbutton delete .
new pushbutton create .
Resolved.
I do not know why the error has occurred.
also
I do not know why the Resolved.