diff --git a/git-portfolio b/git-portfolio
index 3b5d615..895c0d7 100755
--- a/git-portfolio
+++ b/git-portfolio
@@ -6,6 +6,10 @@ if [ -d "$repos" ]; then
 fi
 mkdir -p "$repos"
 tmp_portfolio="/tmp/portfolio-$(cat /dev/urandom | base64 | tr -d '=+/' | head -c 8)"
+if [ -d "$tmp_portfolio" ]; then
+	echo "Error: Temporary directory '$tmp_portfolio' already exists."
+	exit 1
+fi
 function safely_remove_tmp_repos() {
 	if [ "$repos" ] && [ -d "$repos" ]; then
 		if [ "$(find -name .git -type d | wc -l)" -eq 0 ]; then