diff --git a/git-portfolio b/git-portfolio
index 2fec118..3b5d615 100755
--- a/git-portfolio
+++ b/git-portfolio
@@ -1,5 +1,9 @@
 #!/usr/bin/bash
 repos="/tmp/repos-$(cat /dev/urandom | base64 | tr -d '=+/' | head -c 8)"
+if [ -d "$repos" ]; then
+	echo "Error: Temporary directory '$repos' already exists."
+	exit 1
+fi
 mkdir -p "$repos"
 tmp_portfolio="/tmp/portfolio-$(cat /dev/urandom | base64 | tr -d '=+/' | head -c 8)"
 function safely_remove_tmp_repos() {