diff --git a/app/log.py b/app/log.py
index 8ecb99d..cbbef18 100644
--- a/app/log.py
+++ b/app/log.py
@@ -27,12 +27,13 @@ class FunctionFilter(logging.Filter):
         self.modules: list[str] = []
         self.functions: defaultdict[str, list[str]] = defaultdict(list)
 
-        for module in module_functions.keys():
-            if module_functions[module]:
-                for function in module_functions[module]:
-                    self.functions[module].append(function)
-            else:
-                self.modules.append(module)
+        if module_functions:
+            for module in module_functions.keys():
+                if module_functions[module]:
+                    for function in module_functions[module]:
+                        self.functions[module].append(function)
+                else:
+                    self.modules.append(module)
 
     def filter(self, record: logging.LogRecord) -> bool:
         if not getattr(record, "levelname", None) == "DEBUG":