diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 7a1fd7cfbc005a9003164464728ef97efeac7c08..6d101e9db53803913d2e870cfe3565fe57a8b6b6 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -407,9 +407,14 @@ def schema_migrations_table_name
       end
 
       def current_version
-        Base.connection.select_value(
-          "SELECT MAX(CAST(version AS integer)) FROM #{schema_migrations_table_name}"
-        ).to_i rescue 0
+        sm_table = schema_migrations_table_name
+        if Base.connection.table_exists?(sm_table)
+          Base.connection.select_value(
+            "SELECT MAX(CAST(version AS DECIMAL)) FROM #{sm_table}"
+          ).to_i
+        else
+          0
+        end
       end
 
       def proper_table_name(name)