diff --git a/src/add.js b/src/add.js
index 5eb35fc..ea7d2de 100644
--- a/src/add.js
+++ b/src/add.js
@@ -192,7 +192,7 @@ export async function addThumbnail(thumbnails, layerGroup, options) {
     const layer = await imageOverlay(url, bounds, options.crossOrigin);
     if (layer === null) {
       log(1, "image layer is null", url);
-      return addThumbnail(thumbnails, layerGroup, options); // Retry with the remaining thumbnails
+      return await addThumbnail(thumbnails, layerGroup, options); // Retry with the remaining thumbnails
     }
     addLayer(layer, layerGroup, asset);
     return await new Promise(resolve => {
diff --git a/src/utils/bbox-to-bounds.js b/src/utils/bbox-to-bounds.js
index 1061426..ddfd537 100644
--- a/src/utils/bbox-to-bounds.js
+++ b/src/utils/bbox-to-bounds.js
@@ -5,7 +5,16 @@
  * @returns
  */
 export default function bboxToLatLngBounds(bbox) {
-  const [xmin, ymin, xmax, ymax] = bbox;
+  let xmin, ymin, xmax, ymax, _;
+  if (bbox.length === 6) {
+    [xmin, ymin, _, xmax, ymax, _] = bbox;
+  }
+  else if (bbox.length === 4) {
+    [xmin, ymin, xmax, ymax] = bbox;
+  }
+  else {
+    return null;
+  }
   const southWest = [ymin, xmin];
   const northEast = [ymax, xmax];
   return L.latLngBounds(southWest, northEast);
diff --git a/src/utils/image-overlay.js b/src/utils/image-overlay.js
index f5a1187..84c265c 100644
--- a/src/utils/image-overlay.js
+++ b/src/utils/image-overlay.js
@@ -14,7 +14,7 @@ export default async function imageOverlay(url, bounds, crossOrigin, options) {
     } catch {
       return null;
     }
-    const lyr = L.imageOverlay(url, bounds, options);
+    const lyr = L.imageOverlay(img, bounds, options);
     return lyr;
   } catch {
     return null;