diff --git a/src/Assetic/Asset/FileAsset.php b/src/Assetic/Asset/FileAsset.php
index b1ebe92e4..a38f032d3 100644
--- a/src/Assetic/Asset/FileAsset.php
+++ b/src/Assetic/Asset/FileAsset.php
@@ -1,5 +1,6 @@
 <?php namespace October\Rain\Assetic\Asset;
 
+use File;
 use October\Rain\Assetic\Filter\FilterInterface;
 use October\Rain\Assetic\Util\VarUtils;
 use InvalidArgumentException;
@@ -36,7 +37,7 @@ public function __construct($source, $filters = [], $sourceRoot = null, $sourceP
                 $sourcePath = basename($source);
             }
         }
-        elseif (null === $sourcePath) {
+        elseif ($sourcePath === null) {
             if (strpos($source, $sourceRoot) !== 0) {
                 throw new InvalidArgumentException(sprintf('The source "%s" is not in the root directory "%s"', $source, $sourceRoot));
             }
@@ -57,7 +58,7 @@ public function load(FilterInterface $additionalFilter = null)
         $source = VarUtils::resolve($this->source, $this->getVars(), $this->getValues());
 
         if (!is_file($source)) {
-            throw new RuntimeException(sprintf('The source file "%s" does not exist.', $source));
+            throw new RuntimeException(sprintf('The source file "%s" does not exist.', File::nicePath($source)));
         }
 
         $this->doLoad(file_get_contents($source), $additionalFilter);
@@ -71,7 +72,7 @@ public function getLastModified()
         $source = VarUtils::resolve($this->source, $this->getVars(), $this->getValues());
 
         if (!is_file($source)) {
-            throw new RuntimeException(sprintf('The source file "%s" does not exist.', $source));
+            throw new RuntimeException(sprintf('The source file "%s" does not exist.', File::nicePath($source)));
         }
 
         return filemtime($source);
diff --git a/src/Assetic/Combiner.php b/src/Assetic/Combiner.php
index 4cfe94f6f..412283810 100644
--- a/src/Assetic/Combiner.php
+++ b/src/Assetic/Combiner.php
@@ -1,10 +1,10 @@
 <?php namespace October\Rain\Assetic;
 
+use File;
 use October\Rain\Assetic\Asset\FileAsset;
 use October\Rain\Assetic\Asset\AssetCache;
 use October\Rain\Assetic\Asset\AssetCollection;
 use October\Rain\Assetic\Cache\FilesystemCache;
-use File;
 
 /**
  * Combiner helper class
@@ -64,15 +64,17 @@ public function prepareCombiner(array $assets, $options = [])
         $filesSalt = null;
         foreach ($assets as $asset) {
             $filters = $this->getFilters(File::extension($asset), $production);
-            $path = file_exists($asset)
-                ? $asset
-                : (File::symbolizePath($asset, null) ?: $this->localPath . $asset);
+
+            $path = File::symbolizePath($asset);
+            if (!file_exists($path) && file_exists($this->localPath . $asset)) {
+                $path = $this->localPath . $asset;
+            }
 
             $files[] = new FileAsset($path, $filters, base_path());
             $filesSalt .= $this->localPath . $asset;
         }
-        $filesSalt = md5($filesSalt);
 
+        $filesSalt = md5($filesSalt);
         $collection = new AssetCollection($files, [], $filesSalt);
         $collection->setTargetPath($targetPath);
 
diff --git a/src/Assetic/Factory/AssetFactory.php b/src/Assetic/Factory/AssetFactory.php
index 61efefa73..43607bf54 100644
--- a/src/Assetic/Factory/AssetFactory.php
+++ b/src/Assetic/Factory/AssetFactory.php
@@ -257,7 +257,7 @@ public function generateAssetName($inputs, $filters, $options = [])
     public function getLastModified(AssetInterface $asset)
     {
         $mtime = 0;
-        foreach ($asset instanceof AssetCollectionInterface ? $asset : array($asset) as $leaf) {
+        foreach ($asset instanceof AssetCollectionInterface ? $asset : [$asset] as $leaf) {
             $mtime = max($mtime, $leaf->getLastModified());
 
             if (!$filters = $leaf->getFilters()) {
@@ -272,7 +272,7 @@ public function getLastModified(AssetInterface $asset)
                     continue;
                 }
 
-                // extract children from leaf after running all preceeding filters
+                // Extract children from leaf after running all preceding filters
                 $clone = clone $leaf;
                 $clone->clearFilters();
                 foreach (array_slice($prevFilters, 0, -1) as $prevFilter) {
@@ -298,7 +298,7 @@ public function getLastModified(AssetInterface $asset)
      *  * A glob:          If the string contains a "*" it will be interpreted as a glob
      *  * A path:          Otherwise the string is interpreted as a filesystem path
      *
-     * Both globs and paths will be absolutized using the current root directory.
+     * Both globs and paths will be absolute using the current root directory.
      *
      * @param string $input   An input string
      * @param array  $options An array of options
@@ -384,7 +384,7 @@ private static function isAbsolutePath($path)
     }
 
     /**
-     * Loops through the root directories and returns the first match.
+     * findRootDir loops through the root directories and returns the first match.
      *
      * @param string $path  An absolute path
      * @param array  $roots An array of root directories
diff --git a/src/Assetic/Traits/HasDeepHasher.php b/src/Assetic/Traits/HasDeepHasher.php
index 3989b18ae..bc0e04ae2 100644
--- a/src/Assetic/Traits/HasDeepHasher.php
+++ b/src/Assetic/Traits/HasDeepHasher.php
@@ -29,9 +29,16 @@ public function getDeepHashFromAssets($assets)
     {
         $key = '';
 
-        $assetFiles = array_map(function ($file) {
-            return file_exists($file) ? $file : (File::symbolizePath($file, null) ?: $this->localPath . $file);
-        }, $assets);
+        $assetFiles = [];
+        foreach ($assets as $file) {
+            $path = File::symbolizePath($file);
+            if (file_exists($path)) {
+                $assetFiles[] = $path;
+            }
+            elseif (file_exists($this->localPath . $path)) {
+                $assetFiles[] = $this->localPath . $path;
+            }
+        }
 
         foreach ($assetFiles as $file) {
             $filters = $this->getFilters(File::extension($file));