diff --git a/cppython/builder.py b/cppython/builder.py
index ab552d4..d62d39a 100644
--- a/cppython/builder.py
+++ b/cppython/builder.py
@@ -245,12 +245,14 @@ def create_generator(
 
         table = generator_configuration.get(name, {})
 
-        if name not in generator_configuration.values():
+        if name not in generator_configuration.keys():
             self.logger.error(
                 "The pyproject.toml table 'tool.cppython.generator.%s' does not exist. Sending generator empty data",
                 name,
             )
 
+            self.logger.debug("The key '%s' does not found in these keys '%s'", name, generator_configuration.keys())
+
         generator_data = resolve_generator(core_data.project_data)
 
         cppython_plugin_data = resolve_cppython_plugin(core_data.cppython_data, supported_plugin_type)