diff --git a/src/Sql/Join.php b/src/Sql/Join.php
index 4b40aca..2acf286 100644
--- a/src/Sql/Join.php
+++ b/src/Sql/Join.php
@@ -69,6 +69,7 @@ class Join
      * @param  mixed       $foreignTable
      * @param  array       $columns
      * @param  string      $join
+     * @throws Exception
      */
     public function __construct(AbstractSql $sql, mixed $foreignTable, array $columns, string $join = 'JOIN')
     {
@@ -78,10 +79,12 @@ public function __construct(AbstractSql $sql, mixed $foreignTable, array $column
         if (($foreignTable instanceof Select) || ($foreignTable instanceof \Pop\Db\Sql)) {
             $this->foreignTable = (string)$foreignTable;
         } else if (is_array($foreignTable)) {
-            foreach ($foreignTable as $alias => $table) {
-                $this->foreignTable = $this->sql->quoteId($table) . ' AS ' . $this->sql->quoteId($alias);
-                break;
+            if (count($foreignTable) !== 1) {
+                throw new Exception('Error: Only one table can be used in JOIN clause.');
             }
+            $alias = array_key_first($foreignTable);
+            $table = $foreignTable[$alias];
+            $this->foreignTable = $this->sql->quoteId($table) . ' AS ' . $this->sql->quoteId($alias);
         } else {
             $this->foreignTable = $this->sql->quoteId($foreignTable);
         }
diff --git a/src/Sql/Select.php b/src/Sql/Select.php
index 739b3a8..25e398a 100644
--- a/src/Sql/Select.php
+++ b/src/Sql/Select.php
@@ -457,11 +457,12 @@ public function render(): string
             $sql .= (string)$this->table;
         // Else, if there is an aliased table
         } else if (is_array($this->table)) {
-            if (count($this->table) !== 1)
+            if (count($this->table) !== 1) {
                 throw new Exception('Error: Only one table can be used in FROM clause.');
+            }
             $alias = array_key_first($this->table);
             $table = $this->table[$alias];
-            $sql .= $this->quoteId($table) . ' AS ' . $this->quoteId($alias);
+            $sql  .= $this->quoteId($table) . ' AS ' . $this->quoteId($alias);
         // Else, just select from the table
         } else {
             $sql .= $this->quoteId($this->table);
@@ -474,27 +475,27 @@ public function render(): string
             }
         }
 
-        // Build any WHERE clauses
+        // Build WHERE clause
         if ($this->where !== null) {
             $sql .= ' WHERE ' . $this->where;
         }
 
-        // Build any HAVING clause
+        // Build HAVING clause
         if ($this->having !== null) {
             $sql .= ' HAVING ' . $this->having;
         }
 
-        // Build any GROUP BY clause
+        // Build GROUP BY clause
         if ($this->groupBy !== null) {
             $sql .= ' GROUP BY ' . $this->groupBy;
         }
 
-        // Build any ORDER BY clause
+        // Build ORDER BY clause
         if ($this->orderBy !== null) {
             $sql .= ' ORDER BY ' . $this->orderBy;
         }
 
-        // Build any LIMIT clause for all other database types.
+        // Build LIMIT clause for all other database types.
         if (!$this->isSqlsrv()) {
             if ($this->limit !== null) {
                 if ((str_contains($this->limit, ',')) && ($this->isPgsql())) {
@@ -506,7 +507,7 @@ public function render(): string
             }
         }
 
-        // Build any OFFSET clause for all other database types.
+        // Build OFFSET clause for all other database types.
         if (!$this->isSqlsrv()) {
             if ($this->offset !== null) {
                 $sql .= ' OFFSET ' . $this->offset;
@@ -523,6 +524,7 @@ public function render(): string
     /**
      * Render the SELECT statement
      *
+     * @throws Exception
      * @return string
      */
     public function __toString(): string
diff --git a/tests/Sql/JoinTest.php b/tests/Sql/JoinTest.php
index a81e82d..c9ae5cc 100644
--- a/tests/Sql/JoinTest.php
+++ b/tests/Sql/JoinTest.php
@@ -36,6 +36,13 @@ public function testForeignTableAlias()
         $this->assertEquals('SELECT * FROM `users` LEFT JOIN `user_info` AS `userinfo` ON (`userinfo`.`user_id` = `users`.`id`)', $sql->render());
     }
 
+    public function testForeignTableAliasException()
+    {
+        $this->expectException('Pop\Db\Sql\Exception');
+        $sql = $this->db->createSql();
+        $sql->select()->from('users')->leftJoin(['userinfo' => 'user_info', 'another_table' => 'another_info'], ['userinfo.user_id' => 'users.id']);
+    }
+
     public function testForeignTableSql()
     {
         $sql1 = $this->db->createSql();