diff --git a/imageInput.c b/imageInput.c
index 28c61cd..cc5ce65 100644
--- a/imageInput.c
+++ b/imageInput.c
@@ -55,7 +55,8 @@ GrayScaleImageSeries *readImages(const char *path)
         }
         else
         {
-            series = NULL;
+            fclose(readSource);
+            return NULL;
         }
         
         fclose(readSource);