diff --git a/src/classes/repositories/class-tainacan-filters.php b/src/classes/repositories/class-tainacan-filters.php
index c7762cce3..412bf994b 100644
--- a/src/classes/repositories/class-tainacan-filters.php
+++ b/src/classes/repositories/class-tainacan-filters.php
@@ -178,7 +178,7 @@ class Filters extends Repository {
     public function fetch($args = [], $output = null){
         if( is_numeric($args) ){
             return new Entities\Filter($args);
-        } elseif (!empty($args)) {
+        } elseif (is_array($args)) {
             // TODO: get filters from parent collections
             $args = array_merge([
                 'posts_per_page' => -1,
diff --git a/src/classes/repositories/class-tainacan-items.php b/src/classes/repositories/class-tainacan-items.php
index b4f94c720..8e94cd785 100644
--- a/src/classes/repositories/class-tainacan-items.php
+++ b/src/classes/repositories/class-tainacan-items.php
@@ -61,9 +61,11 @@ class Items extends Repository {
         }
          
         // register taxonomies
-        foreach ($taxonomies as $taxonomy) {
-            $taxonomy->register_taxonomy();
-        }  
+        if (is_array($taxonomies) && sizeof($taxonomies) > 0) {
+            foreach ($taxonomies as $taxonomy) {
+                $taxonomy->register_taxonomy();
+            }  
+        }
     }
  
     public function insert($item) {
diff --git a/src/classes/repositories/class-tainacan-logs.php b/src/classes/repositories/class-tainacan-logs.php
index 2ee17163c..8a1f4f7d3 100644
--- a/src/classes/repositories/class-tainacan-logs.php
+++ b/src/classes/repositories/class-tainacan-logs.php
@@ -124,7 +124,7 @@ class Logs extends Repository {
     public function fetch($args = [], $output = null){
         if(is_numeric($args)){
     	    return new Entities\Log($args);
-        } else {
+        } elseif (is_array($args)) {
             $args = array_merge([
                 'post_status'    => 'publish',
             ], $args);
diff --git a/src/classes/repositories/class-tainacan-metadatas.php b/src/classes/repositories/class-tainacan-metadatas.php
index c1dae1124..8da6fe7c0 100644
--- a/src/classes/repositories/class-tainacan-metadatas.php
+++ b/src/classes/repositories/class-tainacan-metadatas.php
@@ -202,7 +202,7 @@ class Metadatas extends Repository {
 
         if( is_numeric($args) ){
             return new Entities\Metadata($args);
-        } elseif (!empty($args)) {
+        } elseif (is_array($args)) {
 
             $args = array_merge([
                 'posts_per_page' => -1,
diff --git a/src/classes/repositories/class-tainacan-taxonomies.php b/src/classes/repositories/class-tainacan-taxonomies.php
index 19c3b3f8e..538cd2489 100644
--- a/src/classes/repositories/class-tainacan-taxonomies.php
+++ b/src/classes/repositories/class-tainacan-taxonomies.php
@@ -163,7 +163,7 @@ class Taxonomies extends Repository {
         
         if( is_numeric($args) ){
             return new Entities\Taxonomy($args);
-        } elseif (!empty($args)) {
+        } elseif (is_array($args)) {
 
             $args = array_merge([
                 'posts_per_page' => -1,