diff --git a/app/log.py b/app/log.py
index 0f46f8a..fd0ed5f 100644
--- a/app/log.py
+++ b/app/log.py
@@ -2,7 +2,8 @@
 
 import logging
 import logging.handlers
-import stackprinter
+import os
+import stackprinter                         # type: ignore
 import sys
 import traceback
 
@@ -75,7 +76,7 @@ def log_uncaught_exceptions(_ex_cls, ex, tb):
     logging.critical(''.join(traceback.format_tb(tb)))
     print("\033[1;37;40m")
     print(stackprinter.format(ex, style="darkbg2", add_summary=True))
-    if os.environ("MM_ENV") != "DEVELOPMENT":
+    if os.environ["MM_ENV"] != "DEVELOPMENT":
         msg = stackprinter.format(ex)
         send_mail(Config.ERRORS_TO, Config.ERRORS_FROM,
                   "Exception from musicmuster", msg)