diff --git a/nonebot/log.py b/nonebot/log.py
index 19739227..a0f6bceb 100644
--- a/nonebot/log.py
+++ b/nonebot/log.py
@@ -13,6 +13,7 @@ FrontMatter:
 """
 
 import sys
+import inspect
 import logging
 from typing import TYPE_CHECKING
 
@@ -45,6 +46,7 @@ logger: "Logger" = loguru.logger
 # logger.addHandler(default_handler)
 
 
+# https://loguru.readthedocs.io/en/stable/overview.html#entirely-compatible-with-standard-logging
 class LoguruHandler(logging.Handler):  # pragma: no cover
     """logging 与 loguru 之间的桥梁，将 logging 的日志转发到 loguru。"""
 
@@ -54,8 +56,8 @@ class LoguruHandler(logging.Handler):  # pragma: no cover
         except ValueError:
             level = record.levelno
 
-        frame, depth = sys._getframe(6), 6
-        while frame and frame.f_code.co_filename == logging.__file__:
+        frame, depth = inspect.currentframe(), 0
+        while frame and (depth == 0 or frame.f_code.co_filename == logging.__file__):
             frame = frame.f_back
             depth += 1
 
diff --git a/nonebot/plugin/on.py b/nonebot/plugin/on.py
index b575282b..7c0934c5 100644
--- a/nonebot/plugin/on.py
+++ b/nonebot/plugin/on.py
@@ -76,7 +76,7 @@ def get_matcher_module(depth: int = 1) -> Optional[ModuleType]:  # pragma: no co
     return (source := get_matcher_source(depth + 1)) and source.module
 
 
-def get_matcher_source(depth: int = 1) -> Optional[MatcherSource]:
+def get_matcher_source(depth: int = 0) -> Optional[MatcherSource]:
     """获取事件响应器定义所在源码信息。
 
     参数:
@@ -85,7 +85,14 @@ def get_matcher_source(depth: int = 1) -> Optional[MatcherSource]:
     current_frame = inspect.currentframe()
     if current_frame is None:
         return None
-    frame = inspect.getouterframes(current_frame)[depth + 1].frame
+
+    frame = current_frame
+    d = depth + 1
+    while d > 0:
+        frame = frame.f_back
+        if frame is None:
+            raise ValueError("Depth out of range")
+        d -= 1
 
     module_name = (module := inspect.getmodule(frame)) and module.__name__