diff --git a/src/Helpers/ImageHelper.php b/src/Helpers/ImageHelper.php
index 6d96ee9..4b3ffc7 100644
--- a/src/Helpers/ImageHelper.php
+++ b/src/Helpers/ImageHelper.php
@@ -280,19 +280,19 @@ public function generateSrcSet(int $attachmentId, array $sizes, string|float|int
     }
 
     /**
-     * @param array<int, BreakPoint> $sizes
+     * @param array<int, BreakPoint> $breakpoints
      * @return array{sizes: string[]|null[], media_query: string, srcset?: string[]}[]
      */
-    protected function generateSources(array $sizes, ?string $aspectRatio): array
+    protected function generateSources(array $breakpoints, ?string $aspectRatio): array
     {
         $sources = [];
         $sourceSizes = [];
 
-        foreach ($sizes as $breakpointWidth => $breakpoint) {
+        foreach ($breakpoints as $breakpointWidth => $breakpoint) {
             $source = ['sizes' => []];
 
-            $nextBreakpointWidth = $this->getNextKey($sizes, $breakpointWidth);
-            $nextBreakpoint = $sizes[$nextBreakpointWidth] ?? null;
+            $nextBreakpointWidth = $this->getNextKey($breakpoints, $breakpointWidth);
+            $nextBreakpoint = $breakpoints[$nextBreakpointWidth] ?? null;
 
             $sourceSizes[$breakpointWidth] = $breakpoint->getWidth();
 
@@ -342,9 +342,10 @@ protected function generateSources(array $sizes, ?string $aspectRatio): array
     protected function generateSizesAttribute(array $sizes): ?string
     {
         $sizesAttributeParts = [];
+        $prevWidth = null;
 
         foreach ($sizes as $breakpointWidth => $width) {
-            if ($width) {
+            if ($width && $width !== $prevWidth) {
                 $nextBreakpointWidth = $this->getNextKey($sizes, $breakpointWidth);
                 $nextWidth = $sizes[$nextBreakpointWidth] ?? null;
 
@@ -353,6 +354,8 @@ protected function generateSizesAttribute(array $sizes): ?string
                 } else {
                     $sizesAttributeParts[] = $width;
                 }
+
+                $prevWidth = $width;
             }
         }
 
@@ -460,7 +463,7 @@ public static function calculateAspectRatio(string|float|int|null $aspectRatio,
 
         $originalImageSize = wp_get_attachment_image_src($attachmentId, 'full');
 
-        if (is_array($originalImageSize) && !empty($originalImageSize)) {
+        if (is_array($originalImageSize) && $originalImageSize) {
             return (int)$originalImageSize[1] / (int)$originalImageSize[2];
         }
 
diff --git a/src/Objects/BreakPoint.php b/src/Objects/BreakPoint.php
index df12506..db683b6 100644
--- a/src/Objects/BreakPoint.php
+++ b/src/Objects/BreakPoint.php
@@ -6,18 +6,13 @@ final class BreakPoint
 {
     private int $attachmentId;
     private string $width;
-    private ?string $unit = null;
+    private string $unit;
 
     public function __construct(int $attachmentId, string $width)
     {
         $this->attachmentId = $attachmentId;
         $this->width = $width;
-
-        if (str_ends_with($this->width, 'px')) {
-            $this->unit = 'px';
-        } elseif (str_ends_with($this->width, 'vw')) {
-            $this->unit = 'vw';
-        }
+        $this->unit = str_ends_with($this->width, 'vw') ? 'vw' : 'px';
     }
 
     public function getAttachmentId(): int
@@ -30,8 +25,8 @@ public function getWidth(): string
         return $this->width;
     }
 
-    /** @return 'px'|'vw'|null */
-    public function getUnit(): ?string
+    /** @return 'px'|'vw' */
+    public function getUnit(): string
     {
         return $this->unit;
     }