diff --git a/cmd/acb/main.go b/cmd/acb/main.go
index 4d94e9a..ef18c8b 100644
--- a/cmd/acb/main.go
+++ b/cmd/acb/main.go
@@ -55,6 +55,14 @@ func main() {
 	//		vikunjaTasks = DoVikunja(*start, *end)
 	//	}
 
+	// Check if OpenAI environment variables are set before calling Summarize
+	openaiEndpoint := os.Getenv("OPENAI_ENDPOINT")
+	openaiToken := os.Getenv("OPENAI_TOKEN")
+	if openaiEndpoint == "" || openaiToken == "" {
+		fmt.Println("Error: OPENAI_ENDPOINT and OPENAI_TOKEN must be set in environment variables to summarize")
+		os.Exit(1)
+	}
+
 	summ, err := SummarizeData(*employeename, prs, issues, vikunjaTasks, *prompt)
 	if err != nil {
 		fmt.Println(fmt.Errorf("error getting PRs: %w", err))