diff --git a/htdocs/asset/list.php b/htdocs/asset/list.php
index 8ea4f46c89d..11bb989a0ed 100644
--- a/htdocs/asset/list.php
+++ b/htdocs/asset/list.php
@@ -407,9 +407,13 @@ print '</tr>'."\n";
 
 // Detect if we need a fetch on each output line
 $needToFetchEachLine=0;
-foreach ($extrafields->attributes[$object->table_element]['computed'] as $key => $val)
-{
-	if (preg_match('/\$object/', $val)) $needToFetchEachLine++;  // There is at least one compute field that use $object
+if (is_array($extrafields->attributes[$object->table_element]['computed'])) {
+    foreach ($extrafields->attributes[$object->table_element]['computed'] as $key => $val) {
+        if (preg_match('/\$object/', $val)) {
+            // There is at least one compute field that use $object
+            $needToFetchEachLine++;
+        }
+    }
 }