ADC gets stuck after doing a HAL_Delay

In the while loop I have this:

HAL_ADC_PollForConversion(&hadc1, 1000);
adcValue = HAL_ADC_GetValue(&hadc1);

The ADC works okay until I execute this line, which is inside a function:

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, GPIO_PIN_SET);
HAL_Delay(3000);
command_dutyC = 0.5;

This delay is used just once in the whole program, i .e, when the delay's completed, it won't execute more.

The rest of the program continues working well after the delay, but the ADC gets stuck, it displays the same value all the time, even when the input is changing.

This is my ADC init:

static void MX_ADC1_Init(void)
{
 
 ADC_ChannelConfTypeDef sConfig;
 
 /**Common config 
 */
 hadc1.Instance = ADC1;
 hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV16;
 hadc1.Init.Resolution = ADC_RESOLUTION_12B;
 hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
 hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
 hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV;
 hadc1.Init.LowPowerAutoWait = DISABLE;
 hadc1.Init.ContinuousConvMode = ENABLE;
 hadc1.Init.NbrOfConversion = 1;
 hadc1.Init.DiscontinuousConvMode = DISABLE;
 hadc1.Init.NbrOfDiscConversion = 1;
 hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
 hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
 hadc1.Init.DMAContinuousRequests = DISABLE;
 hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
 hadc1.Init.OversamplingMode = DISABLE;
 if (HAL_ADC_Init(&hadc1) != HAL_OK)
 {
 _Error_Handler(__FILE__, __LINE__);
 }
 
 /**Configure Regular Channel 
 */
 sConfig.Channel = ADC_CHANNEL_8;
 sConfig.Rank = ADC_REGULAR_RANK_1;
 sConfig.SamplingTime = ADC_SAMPLETIME_247CYCLES_5;
 sConfig.SingleDiff = ADC_SINGLE_ENDED;
 sConfig.OffsetNumber = ADC_OFFSET_NONE;
 sConfig.Offset = 0;
 if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
 {
 _Error_Handler(__FILE__, __LINE__);
 }
 
}