[10.x] Fix nested join when not JoinClause instance

src/Illuminate/Database/Query/Grammars/Grammar.php

@@ -504,7 +504,7 @@ protected function whereNested(Builder $query, $where)
         // Here we will calculate what portion of the string we need to remove. If this
         // is a join clause query, we need to remove the "on" portion of the SQL and
         // if it is a normal query we need to take the leading "where" of queries.
-        $offset = $query instanceof JoinClause ? 3 : 6;
+        $offset = $where['query'] instanceof JoinClause ? 3 : 6;
 
         return '('.substr($this->compileWheres($where['query']), $offset).')';
     }

tests/Database/DatabaseQueryBuilderTest.php

@@ -14,6 +14,7 @@
 use Illuminate\Database\Query\Grammars\PostgresGrammar;
 use Illuminate\Database\Query\Grammars\SQLiteGrammar;
 use Illuminate\Database\Query\Grammars\SqlServerGrammar;
+use Illuminate\Database\Query\JoinClause;
 use Illuminate\Database\Query\Processors\MySqlProcessor;
 use Illuminate\Database\Query\Processors\PostgresProcessor;
 use Illuminate\Database\Query\Processors\Processor;
@@ -2425,6 +2426,18 @@ public function testJoinsWithNestedJoinWithAdvancedSubqueryCondition()
         $this->assertEquals(['1', 10000], $builder->getBindings());
     }
 
+    public function testJoinWithNestedOnCondition()
+    {
+        $builder = $this->getBuilder();
+        $builder->select('users.id')->from('users')->join('contacts', function (JoinClause $j) {
+            return $j
+                ->on('users.id', 'contacts.id')
+                ->addNestedWhereQuery($this->getBuilder()->where('contacts.id', 1));
+        });
+        $this->assertSame('select "users"."id" from "users" inner join "contacts" on "users"."id" = "contacts"."id" and ("contacts"."id" = ?)', $builder->toSql());
+        $this->assertEquals([1], $builder->getBindings());
+    }
+
     public function testJoinSub()
     {
         $builder = $this->getBuilder();