diff --git a/api/v1/registry/client/cache/cache.go b/api/v1/registry/client/cache/cache.go
index 01442a9..00ca3c2 100644
--- a/api/v1/registry/client/cache/cache.go
+++ b/api/v1/registry/client/cache/cache.go
@@ -29,7 +29,7 @@ func (t *token) Exists(key string) bool {
 	_, defined := t.items[key]
 
 	if !defined && WaitBetween != 0 {
-		log.Debugf("Locking token operations for %v (key: %s)", WaitBetween, key)
+		log.Debugf("[EXISTS] Locking token operations for %v (key: %s)", WaitBetween, key)
 		time.Sleep(WaitBetween)
 	}
 
@@ -38,6 +38,14 @@ func (t *token) Exists(key string) bool {
 
 // Get gets token for a passed key
 func (t *token) Get(key string) auth.Token {
+	t.mux.Lock()
+	defer t.mux.Unlock()
+
+	if WaitBetween != 0 {
+		log.Debugf("[GET] Locking token operations for %v (key: %s)", WaitBetween, key)
+		time.Sleep(WaitBetween)
+	}
+
 	return t.items[key]
 }
 
diff --git a/api/v1/v1.go b/api/v1/v1.go
index 5bef0ce..62cd8db 100644
--- a/api/v1/v1.go
+++ b/api/v1/v1.go
@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"html/template"
 	"io"
+	"regexp"
 	"runtime"
 	"strings"
 	"time"
@@ -235,6 +236,26 @@ func getPushPrefix(prefix, defaultPrefix string) string {
 	return prefix
 }
 
+func validatePushPrefix(prefix string) error {
+	const ex = `^/[a-z0-9_][a-z0-9_\-\.\/]+/$`
+
+	if prefix == "/" {
+		return nil
+	}
+
+	matched, err := regexp.MatchString(ex, prefix)
+
+	if err != nil {
+		return err
+	}
+
+	if !matched {
+		return fmt.Errorf("Push prefix \"%s\" does not match valid pattern: %s", prefix, ex)
+	}
+
+	return nil
+}
+
 // CollectPushTags blends passed collection with information fetched from [local] "push" registry,
 // makes required comparisons between them and spits organized info back as collection.Collection
 func (api *API) CollectPushTags(cn *collection.Collection, push PushConfig) (*collection.Collection, error) {
@@ -257,7 +278,13 @@ func (api *API) CollectPushTags(cn *collection.Collection, push PushConfig) (*co
 		go func(repo *repository.Repository, i int, done chan error) {
 			refs[i] = repo.Ref()
 
-			pushPath, perr := pushPathTemplate(getPushPrefix(push.Prefix, repo.PushPrefix()), repo.PushPath(push.PathSeparator), repo.Name())
+			pushPrefix := getPushPrefix(push.Prefix, repo.PushPrefix())
+			if err := validatePushPrefix(pushPrefix); err != nil {
+				done <- err
+				return
+			}
+
+			pushPath, perr := pushPathTemplate(pushPrefix, repo.PushPath(push.PathSeparator), repo.Name())
 			if perr != nil {
 				done <- perr
 				return
@@ -439,6 +466,10 @@ func (api *API) PushTags(cn *collection.Collection, push PushConfig) error {
 			for _, tg := range tags {
 				srcRef := repo.Name() + ":" + tg.Name()
 				pushPrefix := getPushPrefix(push.Prefix, repo.PushPrefix())
+				if err := validatePushPrefix(pushPrefix); err != nil {
+					done <- err
+					return
+				}
 				pushPath := repo.PushPath(push.PathSeparator)
 				fullPath, perr := pushPathTemplate(pushPrefix, pushPath, repo.Name())
 				if perr != nil {
diff --git a/api/v1/v1_test.go b/api/v1/v1_test.go
index df7a0c3..f49f703 100644
--- a/api/v1/v1_test.go
+++ b/api/v1/v1_test.go
@@ -288,3 +288,11 @@ func TestMakePushTagTemplate(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, "SNAPSHOT-16.3.1-"+curDate, actualDate)
 }
+
+func TestValidatePushPrefix(t *testing.T) {
+	assert.NoError(t, validatePushPrefix("/"))
+	assert.NoError(t, validatePushPrefix("/foo/bar/"))
+
+	assert.Error(t, validatePushPrefix("/baz"))
+	assert.Error(t, validatePushPrefix("http://localhost:5000"))
+}
diff --git a/main.go b/main.go
index 6b63290..75ae8d0 100644
--- a/main.go
+++ b/main.go
@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/jessevdk/go-flags"
+	log "github.com/sirupsen/logrus"
 
 	v1 "github.com/ivanilves/lstags/api/v1"
 	"github.com/ivanilves/lstags/config"
@@ -49,10 +50,10 @@ var exitCode = 0
 var doNotFail = false
 
 func suicide(err error, critical bool) {
-	fmt.Printf("%s\n", err.Error())
-
 	if !doNotFail || critical {
-		os.Exit(1)
+		log.Fatal(err.Error())
+	} else {
+		log.Error(err.Error())
 	}
 
 	exitCode = 254 // not typical error code, for "git grep" friendliness