diff --git a/kleinanzeigen_bot/selenium_mixin.py b/kleinanzeigen_bot/selenium_mixin.py
index 2497846..0b66d27 100644
--- a/kleinanzeigen_bot/selenium_mixin.py
+++ b/kleinanzeigen_bot/selenium_mixin.py
@@ -108,6 +108,7 @@ class SeleniumMixin:
         else:
             # determine browser major version
             if self.browser_config.binary_location:
+                ensure(os.path.exists(self.browser_config.binary_location), f"Specified browser binary [{self.browser_config.binary_location}] does not exist.")
                 chrome_type, chrome_version = self.get_browser_version(self.browser_config.binary_location)
             else:
                 browser_info = self.find_compatible_browser()