diff --git a/src/Task/Assets/ImageMinify.php b/src/Task/Assets/ImageMinify.php
index 87c5a215..68c2bd75 100644
--- a/src/Task/Assets/ImageMinify.php
+++ b/src/Task/Assets/ImageMinify.php
@@ -216,15 +216,15 @@ public function run()
         }
 
         $amount = (count($files) == 1 ? 'image' : 'images');
-        $message = "Minified {filecount} out of {filetotal} $amount into {destination}";
+        $message = 'Minified {filecount} out of {filetotal} ' . $amount . ' into {destination}';
         $context = ['filecount' => count($this->results['success']), 'filetotal' => count($files), 'destination' => $this->to];
 
-        if (count($this->results['success']) == count($files)) {
-            $this->printTaskSuccess($message, $context);
+        $this->printTaskInfo($message, $context);
 
-            return Result::success($this, $message, $context);
+        if (count($this->results['success']) == count($files)) {
+            return Result::success($this, ucfirst($amount) . ' minified.');
         } else {
-            return Result::error($this, $message, $context);
+            return Result::error($this, ucfirst($amount) . ' minification failed.');
         }
     }
 
@@ -389,6 +389,12 @@ protected function minify($files)
                         $minifier = 'svgo';
                         break;
                 }
+
+                // Skip files without available minifier
+                if ($minifier === '') {
+                    $this->results['error'][] = $from;
+                    continue;
+                }
             } else {
                 if (!in_array($this->minifier, $this->minifiers, true)
                     && !is_callable(strtr($this->minifier, '-', '_'))
diff --git a/tests/integration/AssetsTest.php b/tests/integration/AssetsTest.php
index 6f45aeaa..b48407f6 100644
--- a/tests/integration/AssetsTest.php
+++ b/tests/integration/AssetsTest.php
@@ -76,4 +76,15 @@ public function testImageMinification()
         $this->assertLessThan($initialFileSize, $minifiedFileSize, 'Minified file is smaller than the source file');
         $this->assertGreaterThan(0, $minifiedFileSize, 'Minified file is not empty');
     }
+
+    public function testImageMinificationErrors()
+    {
+        $this->fixtures->createAndCdToSandbox();
+
+        // fails because file is not an image
+        $result = $this->taskImageMinify($this->fixtures->dataFile('sample.css'))
+            ->to(realpath('') . '/dist')
+            ->run();
+        $this->assertFalse($result->wasSuccessful(), $result->getMessage());
+    }
 }