diff --git a/src/Twig/Runtime/IconRuntime.php b/src/Twig/Runtime/IconRuntime.php
index 9d5baa3..55a276b 100644
--- a/src/Twig/Runtime/IconRuntime.php
+++ b/src/Twig/Runtime/IconRuntime.php
@@ -156,7 +156,9 @@ final class IconRuntime implements RuntimeExtensionInterface
             return $svg;
         }
 
-        $this->throwIfTitleIsEmpty($title);
+        if ('' === $title) {
+            throw new \InvalidArgumentException('Title must not be an empty string!');
+        }
 
         return preg_replace('/(<svg(.|\n)*?>\n?)/', "$1<title>$title</title>", $svg);
     }
@@ -177,13 +179,6 @@ final class IconRuntime implements RuntimeExtensionInterface
         return trim(preg_replace('/<\?xml.*\?>/', '', $content));
     }
 
-    private function throwIfTitleIsEmpty(string $title): void
-    {
-        if ('' === $title) {
-            throw new \InvalidArgumentException('Title string must not be empty!');
-        }
-    }
-
     private function setSvgHeightAndWidth(string $content, int $size): string
     {
         $this->throwIfSizeIsNegative($size);