diff --git a/gin_integration_test.go b/gin_integration_test.go
index 41ad9874..fd972657 100644
--- a/gin_integration_test.go
+++ b/gin_integration_test.go
@@ -55,6 +55,13 @@ func TestRunEmpty(t *testing.T) {
 	testRequest(t, "http://localhost:8080/example")
 }
 
+func TestTrustedCIDRsForRun(t *testing.T) {
+	os.Setenv("PORT", "")
+	router := New()
+	router.TrustedProxies = []string{"hello/world"}
+	assert.Error(t, router.Run(":8080"))
+}
+
 func TestRunTLS(t *testing.T) {
 	router := New()
 	go func() {
diff --git a/gin_test.go b/gin_test.go
index 75b13fd4..678d95f2 100644
--- a/gin_test.go
+++ b/gin_test.go
@@ -647,6 +647,15 @@ func TestPrepareTrustedCIRDsWith(t *testing.T) {
 		assert.Error(t, err)
 	}
 
+	// nil value
+	{
+		r.TrustedProxies = nil
+		trustedCIDRs, err := r.prepareTrustedCIDRs()
+
+		assert.Nil(t, trustedCIDRs)
+		assert.Nil(t, err)
+	}
+
 }
 
 func parseCIDR(cidr string) *net.IPNet {