Fix crash when rollback hook is about to be called (#380)

Author: droserasprout

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## [unreleased]
+
+* config: Fixed crash when rollback hook is about to be called.
+
 ## 5.1.4 - 2022-06-02
 
 ### Fixed

src/dipdup/config.py

@@ -1234,7 +1234,7 @@ def per_index_rollback(self) -> bool:
         """Check if package has `on_index_rollback` hook"""
         new_hook = is_importable(f'{self.package}.hooks.on_index_rollback', 'on_index_rollback')
         old_hook = is_importable(f'{self.package}.hooks.on_rollback', 'on_rollback')
-        if new_hook and new_hook:
+        if new_hook and old_hook:
             raise ConflictingHooksError('on_rollback', 'on_index_rollback')
         elif not new_hook and not old_hook:
             raise InitializationRequiredError('none of `on_rollback` or `on_index_rollback` hooks found')