diff --git a/src/FilterService/FilterType/SelectFromMultiSelect.php b/src/FilterService/FilterType/SelectFromMultiSelect.php
index 7769e3d2..0b17013f 100644
--- a/src/FilterService/FilterType/SelectFromMultiSelect.php
+++ b/src/FilterService/FilterType/SelectFromMultiSelect.php
@@ -67,7 +67,9 @@ public function addCondition(AbstractFilterDefinitionType $filterDefinition, Pro
             $value = $preSelect;
         }
 
-        $value = trim($value);
+        if ($value) {
+            $value = trim($value);
+        }
 
         $currentFilter[$field] = $value;
         $db = Db::get();