diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 9a7718ddfe..e8b43695fd 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -8,7 +8,7 @@ Yii Framework 2 Change Log
 - Bug #14157: Add support for loading default value `CURRENT_TIMESTAMP` of MySQL `datetime` field (rossoneri)
 - Bug #15046: Throw an `yii\web\HeadersAlreadySentException` if headers were sent before web response (dmirogin)
 - Enh #3087: Added `yii\helpers\BaseHtml::error()` "errorMethod" option to be able to customize errors display (yanggs07, developeruz)
-- Bug #15355: Fixed `yii\db\Query::from()` does not work with `yii\db\Expression` (vladis84)
+- Bug #15355: Fixed `yii\db\Query::from()` does not work with `yii\db\Expression` (vladis84, silverfire, samdark)
 - Bug #8983: Only truncate the original log file for rotation (matthewyang, developeruz)
 - Bug #14276: Fixed I18N format with dotted parameters (developeruz)
 - Bug #14484: Fixed `yii\validators\UniqueValidator` for target classes with a default scope (laszlovl, developeruz)
diff --git a/framework/db/Query.php b/framework/db/Query.php
index 13aa8bee7f..88be4171ce 100644
--- a/framework/db/Query.php
+++ b/framework/db/Query.php
@@ -10,6 +10,7 @@ namespace yii\db;
 use Yii;
 use yii\base\Component;
 use yii\base\InvalidConfigException;
+use yii\base\InvalidParamException;
 
 /**
  * Query represents a SELECT SQL statement in a way that is independent of DBMS.
@@ -481,60 +482,57 @@ class Query extends Component implements QueryInterface
         // Clean up table names and aliases
         $cleanedUpTableNames = [];
         foreach ($tableNames as $alias => $tableName) {
-            $tableNameString = null;
-            if (is_string($tableName)) {
-                $tableNameString = $tableName;
-            } elseif ($tableName instanceof Expression) {
-                $tableNameString = $tableName->expression;
-            }
-
-            if (!is_string($alias) && $tableNameString !== null) {
+            if (is_string($tableName) && !is_string($alias)) {
                 $pattern = <<<PATTERN
 ~
 ^
 \s*
 (
-    (?:['"`\[]|{{)
+(?:['"`\[]|{{)
+.*?
+(?:['"`\]]|}})
+|
+\(.*?\)
+|
+.*?
+)
+(?:
+(?:
+    \s+
+    (?:as)?
+    \s*
+)
+(
+   (?:['"`\[]|{{)
     .*?
     (?:['"`\]]|}})
     |
-    \(.*?\)
-    |
     .*?
 )
-(?:
-    (?:
-        \s+
-        (?:as)?
-        \s*
-    )
-    (
-       (?:['"`\[]|{{)
-        .*?
-        (?:['"`\]]|}})
-        |
-        .*?
-    )
 )?
 \s*
 $
 ~iux
 PATTERN;
-                if (preg_match($pattern, $tableNameString, $matches)) {
+                if (preg_match($pattern, $tableName, $matches)) {
                     if (isset($matches[2])) {
-                        list(, $tableNameString, $alias) = $matches;
+                        list(, $tableName, $alias) = $matches;
                     } else {
-                        $tableNameString = $alias = $matches[1];
+                        $tableName = $alias = $matches[1];
                     }
                 }
             }
 
+
             if ($tableName instanceof Expression) {
-                $cleanedUpTableNames[$this->ensureNameQuoted($alias)] = $tableNameString;
+                if (!is_string($alias)) {
+                    throw new InvalidParamException('To use Expression in from() method, pass it in array format with alias.');
+                }
+                $cleanedUpTableNames[$this->ensureNameQuoted($alias)] = $tableName;
             } elseif ($tableName instanceof self) {
                 $cleanedUpTableNames[$this->ensureNameQuoted($alias)] = $tableName;
             } else {
-                $cleanedUpTableNames[$this->ensureNameQuoted($alias)] = $this->ensureNameQuoted($tableNameString);
+                $cleanedUpTableNames[$this->ensureNameQuoted($alias)] = $this->ensureNameQuoted($tableName);
             }
         }
 
diff --git a/tests/framework/db/GetTablesAliasTestTrait.php b/tests/framework/db/GetTablesAliasTestTrait.php
index 424ad3a115..dc03e5ef40 100644
--- a/tests/framework/db/GetTablesAliasTestTrait.php
+++ b/tests/framework/db/GetTablesAliasTestTrait.php
@@ -129,13 +129,14 @@ trait GetTablesAliasTestTrait
     public function testGetTableNames_isFromAliasedExpression()
     {
         $query = $this->createQuery();
-        $query->from = new \yii\db\Expression('(SELECT id FROM user) x');
+        $expression = new \yii\db\Expression('(SELECT id FROM user)');
+        $query->from = $expression;
 
+        $this->expectException('yii\base\InvalidParamException');
+        $this->expectExceptionMessage('To use Expression in from() method, pass it in array format with alias.');
         $tables = $query->getTablesUsedInFrom();
 
-        $this->assertEquals([
-            '{{x}}' => '(SELECT id FROM user)',
-        ], $tables);
+        $this->assertEquals(['{{x}}' => $expression], $tables);
     }
 
     public function testGetTableNames_isFromAliasedArrayWithExpression()