diff --git a/go.sh b/go.sh
index 2333d9a..5f8d19e 100755
--- a/go.sh
+++ b/go.sh
@@ -1,3 +1,6 @@
 #!/bin/bash
 
-for x in input/*.cia; do . tools/process.sh $x input/hs.app; done
+if [ -e input/hs.app ]
+then for x in input/*.cia; do . tools/process.sh $x input/hs.app; done
+else printf "ERROR: hs.app not found\nPlease generate hs.app with Decrypt9 and put it into the input folder\n"
+fi