diff --git a/cmd/geth/chaincmd.go b/cmd/geth/chaincmd.go
index f75ee3c8bd..545c10d0c9 100644
--- a/cmd/geth/chaincmd.go
+++ b/cmd/geth/chaincmd.go
@@ -318,7 +318,13 @@ func initNetwork(ctx *cli.Context) error {
 		utils.Fatalf("init.dir is required")
 	}
 	size := ctx.Int(utils.InitNetworkSize.Name)
+	if size <= 0 {
+		utils.Fatalf("size should be greater than 0")
+	}
 	port := ctx.Int(utils.InitNetworkPort.Name)
+	if port <= 0 {
+		utils.Fatalf("port should be greater than 0")
+	}
 	ipStr := ctx.String(utils.InitNetworkIps.Name)
 	cfgFile := ctx.String(configFileFlag.Name)
 
@@ -326,10 +332,6 @@ func initNetwork(ctx *cli.Context) error {
 		utils.Fatalf("config file is required")
 	}
 
-	if size <= 0 {
-		utils.Fatalf("size should be greater than 0")
-	}
-
 	ips, err := parseIps(ipStr, size)
 	if err != nil {
 		utils.Fatalf("Failed to pase ips string: %v", err)