Removed unnecessary instance check, fixed Sphinx schema

extensions/sphinx/Schema.php

@@ -60,6 +60,12 @@ class Schema extends Object
     private $_builder;
 
     /**
+     * @var array map of DB errors and corresponding exceptions
+     * If left part is found in DB error message exception class from the right part is used.
+     */
+    public $exceptionMap = [];
+
+    /**
      * @var array mapping from physical column types (keys) to abstract column types (values)
      */
     public $typeMap = [

framework/db/Command.php

@@ -782,12 +782,10 @@ class Command extends \yii\base\Component
         } else {
             $exceptionClass = '\yii\db\Exception';
             $schema = $this->db->getSchema();
-            if ($schema instanceof Schema) {
-                $exceptionMap = $schema->exceptionMap;
-                foreach ($exceptionMap as $error => $class) {
-                    if (strpos($e->getMessage(), $error) !== false) {
-                        $exceptionClass = $class;
-                    }
+            $exceptionMap = $schema->exceptionMap;
+            foreach ($exceptionMap as $error => $class) {
+                if (strpos($e->getMessage(), $error) !== false) {
+                    $exceptionClass = $class;
                 }
             }