diff --git a/core/lib/Drupal/Core/Schema/SchemaData.php b/core/lib/Drupal/Core/Schema/SchemaData.php
index cdd61a99bb..b3531d97cd 100644
--- a/core/lib/Drupal/Core/Schema/SchemaData.php
+++ b/core/lib/Drupal/Core/Schema/SchemaData.php
@@ -84,7 +84,6 @@ public function getSpecification($module, $table = NULL) {
       if (isset($schema[$table])) {
         return $schema[$table];
       }
-      return [];
     }
     elseif (!empty($schema)) {
       return $schema;
diff --git a/core/modules/simpletest/src/Tests/KernelTestBaseTest.php b/core/modules/simpletest/src/Tests/KernelTestBaseTest.php
index 0c60491e57..38e12b30c2 100644
--- a/core/modules/simpletest/src/Tests/KernelTestBaseTest.php
+++ b/core/modules/simpletest/src/Tests/KernelTestBaseTest.php
@@ -158,8 +158,10 @@ public function testInstallSchema() {
     $this->installSchema($module, $table);
     $this->assertTrue(Database::getConnection()->schema()->tableExists($table), "'$table' database table found.");
 
+    /** @var \Drupal\Core\Schema\SchemaDataInterface $schema_data */
+    $schema_data = \Drupal::service('database.schema.data');
     // Verify that the schema is known to Schema API.
-    $schema = \Drupal::service('database.schema.data')->getSpecification($module, $table);
+    $schema = $schema_data->getSpecification($module, $table);
     $this->assertTrue($schema, "'$table' table schema found.");
 
     // Verify that a unknown table from an enabled module throws an error.
@@ -172,7 +174,7 @@ public function testInstallSchema() {
       $this->pass('Exception for non-retrievable schema found.');
     }
     $this->assertFalse(Database::getConnection()->schema()->tableExists($table), "'$table' database table not found.");
-    $schema = \Drupal::service('database.schema.data')->getSpecification($module, $table);
+    $schema = $schema_data->getSpecification($module, $table);
     $this->assertFalse($schema, "'$table' table schema not found.");
 
     // Verify that a table from a unknown module cannot be installed.
@@ -186,7 +188,7 @@ public function testInstallSchema() {
       $this->pass('Exception for non-retrievable schema found.');
     }
     $this->assertFalse(Database::getConnection()->schema()->tableExists($table), "'$table' database table not found.");
-    $schema = \Drupal::service('database.schema.data')->getSpecification($module, $table);
+    $schema = $schema_data->getSpecification($module, $table);
     $this->assertTrue($schema, "'$table' table schema found.");
 
     // Verify that the same table can be installed after enabling the module.