diff --git a/app.go b/app.go
index d78dcf9..c119f1b 100644
--- a/app.go
+++ b/app.go
@@ -24,6 +24,22 @@ func (c *Config) NewApp(name string, sources, destinations, schedule []string, b
 	log.WithFields(log.Fields{"name": name}).Debugf("starting")
 	defer log.WithFields(log.Fields{"name": name}).Debugf("done")
 
+	if _, ok := c.apps[name]; ok {
+		return nil, fmt.Errorf("app already exist")
+	}
+
+	if len(sources) == 0 {
+		return nil, fmt.Errorf("no sources")
+	}
+
+	if len(destinations) == 0 {
+		return nil, fmt.Errorf("no destinations")
+	}
+
+	if len(schedule) == 0 {
+		return nil, fmt.Errorf("no schedule")
+	}
+
 	a := &App{
 		name:         name,
 		sources:      make([]Addr, 0),
diff --git a/version.go b/version.go
index fa0fdaa..0a37d7f 100644
--- a/version.go
+++ b/version.go
@@ -1,7 +1,7 @@
 // Code generated by version.sh (@generated) DO NOT EDIT.
 package main
-var githash = "d92380c"
+var githash = "ee94b07"
 var branch = "master"
-var buildstamp = "2025-12-28_15:32:36"
-var commits = "122"
-var version = "d92380c-b122 - 2025-12-28_15:32:36"
+var buildstamp = "2025-12-28_15:41:47"
+var commits = "123"
+var version = "ee94b07-b123 - 2025-12-28_15:41:47"