diff --git a/splitio/client/factory.go b/splitio/client/factory.go
index 7b70fd5..48d35ed 100644
--- a/splitio/client/factory.go
+++ b/splitio/client/factory.go
@@ -284,8 +284,8 @@ func setupInMemoryFactory(
 	logger logging.LoggerInterface,
 	metadata dtos.Metadata,
 ) (*SplitFactory, error) {
-	advanced, errs := conf.NormalizeSDKConf(cfg.Advanced)
-	printWarnings(logger, errs)
+	advanced, warnings := conf.NormalizeSDKConf(cfg.Advanced)
+	printWarnings(logger, warnings)
 	if strings.TrimSpace(cfg.SplitSyncProxyURL) != "" {
 		advanced.StreamingEnabled = false
 	}
@@ -656,7 +656,7 @@ func buildImpressionManager(
 func printWarnings(logger logging.LoggerInterface, errs []error) {
 	if len(errs) != 0 {
 		for _, err := range errs {
-			if errType, ok := err.(*dtos.FlagSetValidatonError); ok {
+			if errType, ok := err.(dtos.FlagSetValidatonError); ok {
 				logger.Warning(errType.Message)
 			}
 		}
diff --git a/splitio/client/factory_test.go b/splitio/client/factory_test.go
new file mode 100644
index 0000000..a751260
--- /dev/null
+++ b/splitio/client/factory_test.go
@@ -0,0 +1,35 @@
+package client
+
+import (
+	"testing"
+
+	"github.com/splitio/go-split-commons/v5/flagsets"
+)
+
+func TestPrintWarnings(t *testing.T) {
+
+	flagSets, warnings := flagsets.SanitizeMany([]string{"set1", " set2"})
+	if len(flagSets) != 2 {
+		t.Error("flag set size should be 2")
+	}
+	printWarnings(getMockedLogger(), warnings)
+	if !mW.Matches("Flag Set name  set2 has extra whitespace, trimming") {
+		t.Error("Wrong message")
+	}
+	flagSets, warnings = flagsets.SanitizeMany([]string{"set1", "Set2"})
+	if len(flagSets) != 2 {
+		t.Error("flag set size should be 2")
+	}
+	printWarnings(getMockedLogger(), warnings)
+	if !mW.Matches("Flag Set name Set2 should be all lowercase - converting string to lowercase") {
+		t.Error("Wrong message")
+	}
+	flagSets, warnings = flagsets.SanitizeMany([]string{"set1", "@set4"})
+	if len(flagSets) != 1 {
+		t.Error("flag set size should be 1")
+	}
+	printWarnings(getMockedLogger(), warnings)
+	if !mW.Matches("you passed @set4, Flag Set must adhere to the regular expressions ^[a-z0-9][_a-z0-9]{0,49}$. This means a Flag Set must start with a letter or number, be in lowercase, alphanumeric and have a max length of 50 characters. @set4 was discarded.") {
+		t.Error("Wrong message")
+	}
+}