diff --git a/src/PhpWord/Element/Image.php b/src/PhpWord/Element/Image.php
index bae87ff5..c6dd0e58 100644
--- a/src/PhpWord/Element/Image.php
+++ b/src/PhpWord/Element/Image.php
@@ -454,7 +454,7 @@ class Image extends AbstractElement
             } else {
                 $this->sourceType = self::SOURCE_GD;
             }
-        } elseif (@file_exists($this->source)) {
+        } elseif (is_string($this->source) && @file_exists($this->source)) {
             $this->memoryImage = false;
             $this->sourceType = self::SOURCE_LOCAL;
         } else {