diff --git a/src/models/network.js b/src/models/network.js
index db2eb60..de9dfcc 100644
--- a/src/models/network.js
+++ b/src/models/network.js
@@ -32,5 +32,7 @@ function prettify(host) {
 }
 
 function capitalize(str) {
-	return str.charAt(0).toUpperCase() + str.slice(1);
+	if (typeof str === "string") {
+		return str.charAt(0).toUpperCase() + str.slice(1);
+	}
 }