Prevent null being used as array key

Author: BastianLedererIcinga

src/Behavior/Binary.php

@@ -79,7 +79,7 @@ public function rewriteCondition(Condition $condition, $relation = null)
          * {@see \ipl\Orm\Compat\FilterProcessor::requireAndResolveFilterColumns()}
          */
         $column = $condition->metaData()->get('columnName');
-        if (isset($this->properties[$column])) {
+        if (isset($column) && isset($this->properties[$column])) {
             $value = $condition->metaData()->get('originalValue');
 
             if ($this->isPostgres && is_resource($value)) {