diff --git a/sps30.c b/sps30.c
index 966f4a4..bbd1560 100644
--- a/sps30.c
+++ b/sps30.c
@@ -183,20 +183,19 @@ int8_t sps30_read_firmware_version ( uint8_t * fw_ver_hi, uint8_t * fw_ver_lo )
 	sps30_enable_interrupts();
 
 	// TODO: Proc to vraci NACK? Vyresit.
-	/*if (result != 0) {
-		return SPS30_ERROR;
+	if (result != 0) {
+		// return SPS30_ERROR;
 	}
-	return SPS30_OK;*/
 
 	delay_ms(1);
 	/* read out */
 	sps30_disable_interrupts();
 	result = sps30_i2c_receive(SPS30_I2C_ADDRESS<<1, i2c_rx_buffer, 3);
 	sps30_enable_interrupts();
-	/*if (result != 0)
+	if (result != 0)
 	{
-		return SPS30_ERROR;
-	}*/
+		// return SPS30_ERROR;
+	}
 
 	*fw_ver_hi = i2c_rx_buffer[0];
 	*fw_ver_lo = i2c_rx_buffer[1];