how to solve undefined error in react js when fetching data from API?

how to solve undefined error in react js when fetching data from API?

<br>

Am getting an error like TypeError landing. Slots are undefined
<div className="notification" />
        </header>
        <main
          style={
            ready
              ? {}
              : {
                  height: "100vh",
                  overflow: "hidden"
                }
          }>
          <LandingLoader className={ready ? "fade-out" : ""} />
          <ul
            className="slots"
            style={{
              visibility: ready ? "visible" : "hidden"
            }}>
            {landing &&
              landing.Slots.map((slot,index) => {
                if (slot && !slot.removed) {
                  let fullWidth = "100%";
                  let maxWidth = 576;

              let style = {};
              style["width"] = fullWidth;
              style["maxWidth"] = fullWidth;
              style["height"] = slot.HeightPixel + "px";

              return (
                &lt;li key={index} className="slots" style={style}&gt;
                  &lt;Slot slotItem={slot} slotIndex={index} /&gt;
                &lt;/li&gt;
              );
            }
          })}
      &lt;/ul&gt;
    &lt;/main&gt;
  &lt;/div&gt;


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